Shaykh al-Tusi and Sayyid Ibn Tawus have recorded that Imam Ja`far al-Sadiq (`a) said: One who offers the four-unit prayer ( 2 salat of 2 units each)of Imam `Ali Amir al-Mu'minin (`a) will be as free of sins as newborns and will have all his requests granted.
Method.
In all rakats, recite Surah al-Fatihah once and repeat Surah al-Tawhid (No. 112) fifty times. On completion, say the following dua of Imam `Ali, peace be upon him: :

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سُبْحَانَ مَنْ لاَ تَبِيدُ مَعَالِمُهُ

subhana man la tabidu ma`alimuhu
Glory be to Him Whose signs never perish.

سُبْحَانَ مَنْ لاَ تَنْقُصُ خَزَائِنُهُ

subhana man la tanqusu khaza'inuhu
Glory be to Him Whose reserves never downgrade.

سُبْحَانَ مَنْ لاَ ٱضْمِحْلاَلَ لِفَخْرِهِ

subhana man la idmihlala lifakhrihi
Glory be to Him Whose honor never vanishes.

سُبْحَانَ مَنْ لاَ يَنْفَدُ مَا عِنْدَهُ

subhana man la yanfadu ma `indahu
Glory be to Him Whose possessions never run out.

سُبحَانَ مَنْ لاَ ٱنْقِطَاعَ لِمُدَّتِهِ

subhana man la inqita`a limuddatihi
Glory be to Him Whose duration (of existence) is never interrupted.

سُبْحَانَ مَنْ لاَ يُشَارِكُ احَداً فِي امْرِهِ

subhana man la yushariku ahadan fi amrihi
Glory be to Him Who never betakes to Himself a partner in His affairs.

سُبْحَانَ مَنْ لاَ إِلٰهَ غَيْرُهُ

subhana man la ilaha ghayruhu
Glory be to Him save Whom there is no god.

Thereafter, say the following supplicatory prayer:

يَا مَنْ عَفَا عَنِ ٱلسَّيِئَاتِ وَلَمْ يُجَازِ بِهَا

ya man `afa `ani alssayyi'ati wa lam yujazi biha
O He who overlooks sins and does not inflict punishment in return,

إرْحَمْ عَبْدَكَ يَا اللَّهُ

irham `abdaka ya allahu
(please) have mercy on Your servant, O Allah,

نَفْسِي نَفْسِي

nafsi nafsi
that is I myself, that is I myself.

انَا عَبْدُكَ يَا سَيِّْدَاهُ

ana `abduka ya sayyidahu
I am Your servant, O my Chief,

انَا عَبْدُكَ بَيْنَ يَدَيْكَ يَا رَبَّاهُ

ana `abduka bayna yadayka ya rabbahu
I am Your servant; I am at Your disposal; O my Lord.

إِلٰهِي بِكَيْنُونَتِكَ يَا امَلاَهُ

ilahi bikaynunatika ya amalahu
O my God, in the name of Your Being, O my Hope,

يَا رَحْمٰنَاهُ يَا غِيَاثَاهُ

ya rahmanahu ya ghiyathahu
O my All-beneficent, O my Supporter,

عَبْدُكَ عَبْدُكَ لاَ حِيلَةَ لَهُ

`abduka `abduka la hilata lahu
Your servant, Your servant, has no strategy.

يَا مُنتَهىٰ رَغْبَتَاهُ

ya muntaha raghbatahu
O Ultimate of my desire!

يَا مُجْرِيَ ٱلدَّمِ فِي عُرُوقِ عَبْدِكَ

ya mujriya alddami fi `uruqi `abdika
O He Who makes blood run into the veins of Your slave!

يَا سَيِّدَاهُ يَا مَالِكَاهُ

ya sayyidahu ya malikahu
O my Chief, O my Master!

ايَا هُوَ ايَا هُوَ يَا رَبَّاهُ

aya huwa aya huwa ya rabbahu
O He Who is Unique! O He Who is Unique! O my Lord!

عَبْدُكَ عَبْدُكَ

`abduka `abduka
I—Your servant, Your servant—

لاَ حِيلَةَ لِي وَلاَ غِنىٰ بِي عَنْ نَفسِْي

la hilata li wa la ghinan bi `an nafsi
have no strategy and I cannot avail myself

وَلاَ اسْتَطِيعُ لَهَا ضَرّاً وَلاَ نَفْعاً

wa la astati`u laha darran wa la naf`an
and I have no control over loss or over profit.

وَلاَ اجِدُ مَنْ اصَانِعُهُ

wa la ajidu man usani`uhu
I do not find anyone from whom I may seek help;

تَقَطَّعَتْ اسْبَابُ ٱلْخَدَائِعِ عَنِّي

taqatta`at asbabu alkhada'i`i `anni
so, all profitable avenues have been blocked,

وَاضْمَحَلَّ كُلُّ مَظْنُونٍ عنِّي

wadmahalla kullu maznunin `anni
and all my expectations have turned into disappointments.

افْرَدَنِِي ٱلدَّهْرُ إِلَيْكَ

afradani alddahru ilayka
Helpless and forsaken I came to You,

فَقُمْتُ بَيْنَ يَدَيْكَ هٰذَا ٱلْمَقَامَ

faqumtu bayna yadayka hadha almaqama
So, I have presented myself before You in this current stand.

يَا إِلٰهِي بِعِلْمِكَ كَانَ هٰذَا كُلُّهُ

ya ilahi bi`ilmika kana hadha kulluhu
O my God, You are aware of all that which I speak about.

فَكَيْفَ انْتَ صَانِعٌ بِي

fakayfa anta sani`un bi
So, how would You deal with me?

وَلَيْتَ شِعْرِي كَيْفَ تَقُولُ لِدُعَائي

wa layta shi`ri kayfa taqulu lidu`a'i
If I but knew how would You dispense with my prayer?

اتَقُولُ نَعْمَ امْ تَقُولُ لاَ

ataqulu na`am am taqulu la
Would You say, ‘Yes’ or ‘No’?

فَإِنْ قُلْتَ لاَ فَيَا وَيْلِي يَا وَيْلِي يَا ويْلِي

fa-in qulta la fayawayli yawayli yawayli
If You say ‘No,’ then I am ruined! I am ruined! I am ruined!

يَا عَوْلِي يَا عَوْلِي يَا عَوْلِي

ya `awli ya `awli ya `awli
Woe to me! Woe to me! Woe to me!

يَا شِقْوَتِي يَا شِقْوَتِي يَا شِقْوَتِي

ya shiqwati ya shiqwati ya shiqwati
Oh my misery! Oh my misery! Oh my misery!

يَا ذُلّي يَا ذُلِّي يَا ذُلِّي

ya dhulli ya dhulli ya dhulli
Oh my ill-luck! Oh my ill-luck! Oh my ill-luck!

إِلَىٰ مَنْ وَمِمَّنْ

ila man wa mimman
To whom? By Whom?

اوْ عِنْدَ مَنْ اوْ كَيْفَ اوْ مَاذَا

aw `inda man aw kayfa aw madha
From whom? How? What?

اوْ إِلَىٰ ايِّ شَيْءٍ الْجَا

aw ila ayyi shay'in alja'u
In which place to take shelter?

وَمَنْ ارْجُو

wa man arju
For whom shall I hope?

وَمَنْ يَجُودُ عَلَيَّ بِفَضْلِهِ حِينِ تَرْفُضُنِي

wa man yajudu `alayya bifadlihi hina tarfuduni
Who shall bestow upon me with his favor when You forsake me?

يَا وَاسِعَ ٱلْمَغْفِرَةِ

ya wasi`a almaghfirati
O Liberal in forgiveness!

وَإِنْ قُلْتَ نَعَمْ كَمَا هُوَ ٱلظَّنُّ بِكَ وَٱلرَّجَاءُ لَكَ

wa in qulta na`am kama huwa alzzannu bika walrraja'u laka
But if You say ‘Yes,’ as I expect You to say and as I desire from You,

فَطُوبَىٰ لِي انَا ٱلسَّعيدُ وَانَا ٱلْمَسْعُودُ

fatuba li ana alssa`idu wa ana almas`udu
then joy is for me, I am successful, I am happy;

فَطُوبِي لِي وَانَا ٱلْمَرْحُومُ

fatuba li wa ana almarhumu
then joy is for me, I will receive (Your) mercy.

يَا مُتَرَحِّمُ يَامُتَرَئِّفُ

ya mutarahhimu ya mutara''ifu
O Ever-merciful! O Ever-compassionate!

يَا مُتَعَطِّفُ يَا يَا مُتَحَنِّنُ

ya muta`attifu ya mutahanninu
O Ever-sympathetic! O Ever-commiserating!

يَا مُتَمَلِّكُ يَا مُقْسِطُ

ya mutamalliku ya muqsitu
O Ever-sovereign! O Just!

لاَ عَمَلَ لِي ابْلُغُ بِهِ نَجَاحَ حَاجَتِي

la `amala li ablughu bihi najaha hajati
I lack any act due to which I can attain achievement of my desire.

اسْالُكَ بِٱسْمِكَ ٱلَّذِي جَعَلْتَهُ فِي مَكْنُونِ غَيْبِكَ

as'aluka bismika alladhi ja`altahu fi maknuni ghaybika
I thus beseech You in the name of Your Name which You have reserved in the innermost of Your Hidden Knowledge

وَٱسْتَقَرَّ عِنْدَكَ فَلاَ يَخْرُجُ مِنْكَ إِلىٰ شَيْءٍ سِوَاكَ

wastaqarra `indaka fala yakhruju minka ila shay'in siwaka
and it has thus settled with You so firmly that nothing of it can come out from You to any other thing.

اسْالُكَ بِهِ وَبِكَ فَإنَّهُ اجَلُّ وَاشْرَفُ اسْمَائِكَ

as'aluka bihi wa bika fa'innahu ajallu wa ashrafu asma'ika
I beseech You by it and by You, for it is certainly the most exalted and honored of Your Names.

لاَ شَيْءَ لِي غَيْرُ هٰذَا

la shay'a li ghayru hadha
I have nothing to mention except this,

وَلاَ احَدَ اعْوَدُ عَلَيَّ مِنْكَ

wa la ahada a`wadu `alayya minka
and no one can be more beneficent to me than You.

يَا كَيْنُونُ يَا مُكَوِّنُ

ya kaynunu ya mukawwinu
O Absolute Being! O Creator of creation!

يَا مَنْ عَرَّفَنِي نَفْسَهُ

ya man `arrafani nafsahu
O He Who has introduced Himself to me!

يَا مَنْ امَرَنِي بِطَاعَتِهِ

ya man amarani bita`atihi
O He Who has commanded me to obey Him!

يَا مَنْ نَهَانِي عَنْ مَعْصِيَتِهِ

ya man nahani `an ma`siyatihi
O He Who has warned me against disobeying Him!

وَيَا مَدْعُوُّ يَا مَسْؤُولُ

wa ya mad`uwwu ya mas'ulu
O He Who is besought! O He Who is pleaded!

يَا مَطْلُوباً إِلَيْهِ

ya matluban ilayhi
O He Who is desired!

رَفَضْتُ وَصِيَّتَكَ ٱلَّتِي اوْصَيْتَنِي وَلَمْ اطِعْكَ

rafadtu wasiyyataka allati awsaytani wa lam uti`ka
I have overlooked Your instructions, which You gave me and have not obeyed You.

وَلَوْ اطَعْتُكَ فِيمَا امَرْتَنِي لَكَفَيْتَنِي مَا قُمْتُ إِلَيْكَ فيهِ

wa law ata`tuka fima amartani lakafaytani ma qumtu ilayka fihi
If I obeyed You in what You have ordered me, You would certainly grant my requests that I am presenting before You.

وَانَا مَعَ مَعْصِيَتِي لَكَ رَاجٍ

wa ana ma`a ma`siyati laka rajin
In spite of my transgression, I am hopeful for You.

فَلاَ تَحُلْ بَيْنِي وَبَيْنَ مَا رَجَوْتُ

fala tahul bayni wa bayna ma rajawtu
So, do not let my hope remain unfulfilled.

يَا مُتَرَحِّماً لِي اعِذْنِي مِنْ بَيْنِ يَدَيَّ وَمِنْ خَلْقِي

ya mutarahhiman li a`idhni min bayni yadayya wa min khalfi
O He Who always has mercy upon me, keep me safe, under Your protection, from (all evils that are) before me, behind me,

وَمِنْ فَوْقِي وَمِنْ تَحْتِي

wa min fawqi wa min tahti
above me, below me,

وَمِنْ كُلِّ جِهَاتِ ٱلإِحَاطَةِ بِي

wa min kulli jihati al-ihatati bi
and from all sides that surround me.

اَللَّهُمَّ بِمُحَمَّدٍ سَيِّدِي

allahumma bimuhammadin sayyidi
O Allah, [I beseech You] in the name of Muhammad, my master,

وَبِعَلِيٍّ وَلِيِّي

wa bi`aliyyin waliyyi
and [in the name of] `Ali, my chief,

وَبِٱلائِمَّةِ ٱلرَّاشِدِينَ عَلَيْهِمُ ٱلسَّلاَمُ

wa bil-a'immati alrrashidina `alayhimu alssalamu
and [in the names of] the orthodox Imams (leaders), peace be upon them,

ٱجْعَلْ عَلَيْنَا صَلَوَاتِكَ وَرَافَتَكَ وَرَحْمتَكَ

ij`al `alayna salawatika wa ra'fataka wa rahmataka
(please) bestow upon us with Your blessings, compassions, and mercy;

وَاوسِعْ عَلَيْنَا مِنْ رِزْقِكَ

wa awsi` `alayna min rizqika
and grant us expansive shares of Your sustenance;

وَٱقْضِ عَنَّا ٱلدَّيْنَ وَجَميعَ حَوَائِجِنَا

waqdi `anna alddayna wa jami`a hawa'ijina
and help us repay our debts and settle all our needs,

يَا اللَّهُ يَا اللَّهُ يَا اللَّهُ

ya allahu ya allahu ya allahu
O Allah, O Allah, O Allah.

إِنَّكَ عَلَىٰ كُلِّ شَيْءٍ قَديرٌ

innaka `ala kulli shay'in qadirun
Verily, You have full power over all things.

The Imam (`a) then added: One who offers this prayer and says this supplication will have all his sins forgiven. Numerous are the narrations that have mentioned splendid reward for those who offer this prayer on Fridays. Similarly, one who says the following supplicatory prayer after that prayer will have all his previous and coming sins forgiven, will be given the reward of him who recites the holy Qur'an entirely twelve times, and will be saved from thirst on the Resurrection Day:

اللَّهُمَّ صَلِّ عَلَىٰ ٱلنَّبِيِّ ٱلْعَرَبِيِّ وَآلِهِ

allahumma salli `ala alnnabiyyi al`arabiyyi wa alihi

O Allah, send blessings to the Arab Prophet and on his Household.