Rabbi wa Rabbukallah
When your eyes fall on the new moon, you must not point to it; rather you should turn yourself towards the kiblah, raise both your hands towards the sky, and address the new moon with the following words:
رَبّي وَرَبّكَ اللّهُ رَبّ العَالَمِينَ.
Your and my Lord is Allah; the Lord of the worlds.
As guidance for people and clear proofs of true guidance and distinction (between the right and the wrong).
اللّهُمّ أَعِنَّا عَلَى صِيَامِهِ،
O Allah: (please) help us observe fasting in it,
وَتَقَبّلْهُ مِنَّا،
And accept it from us,
وَسَلّمْنَا فِيهِ،
And keep us safe during it,
وَسَلّمْنَا مِنْهُ،
And help us observe it adequately,
وَسَلّمْهُ لَنَا فِي يُسْرٍ مِنْكَ وَعَافِيَةٍ،
And keep it sound for us with easiness and good health from You.
إنّكَ عَلَى كُلّ شَيْءٍ قَدِيرٌ،
You verily have power over all things.
يَا رَحْمنُ يَا رَحِيمُ.
O the All-beneficent, O the All-merciful
Allahumma Ahillahu Alayna
It has been narrated that when the Holy Prophet (a.s) would see the new moon of Ramadhan, he would turn his face to the kiblah direction and say the following:
Except that You have pardoned us, forgiven us, and had mercy upon us
Ayyuhal Khalqul Muti
It is recommended, at the sight of the new moon of Ramadhan, to say the supplication number forty-three of the al- Sahifah al-Kamilah al-Sajjadiyyah. Sayyid Ibn Tawus narrated that Imam `Ali ibn al-Husayn Zayn al-Abideen (a.s), once, gazed at the new moon of Ramadhan while he was walking. He therefore stopped and said the following:
أَيّهَا الخَلْقُ المُطِيعُ،
O obedient creature,
الدَّائِبُ السّرِيعُ،
speedy and untiring,
المُتَرَدّدُ فِي مَنَازِلِ التّقْدِيرِ،
frequenter of the mansions of determination,
المُتَصَرّفُ فِي فَلَكِ التّدْبِيرِ،
moving about in the sphere of governance!
آمَنْتُ بِمَنْ نَوّرَ بِكَ الظّلَمَ،
I have faith in Him Who lights up darknesses through you,