Within the recommended rites on Fridays, Shaykh al-Tusi, in his book of Misbah al-Mutahajjid, has mentioned the following from Imam Hasan Askari (peace be upon him):
اَللَّهُمَّ صَلِّ عَلَىٰ عَلِيِّ بْنِ مُحَمَّدٍ
allahumma salli `ala `aliyyi bni muhammadin
O Allah, (please) send blessings upon `Ali the son of Muhammad,
وَصِيِّ ٱلأَوْصِيَاءِ
wasiyyi al-awsiya'i
the successor of the Successors,
وَإِمَامِ ٱلأَتْقِيَاءِ
wa imami al-atqiya'i
the leader of the pious,
وَخَلَفِ أَئِمَّةِ ٱلدِّينِ
wa khalafi a'immati alddini
the descendant of the leaders of the religion,
وَٱلْحُجَّةِ عَلَىٰ ٱلْخَلاَئِقِ أَجْمَعِينَ
walhujjati `ala alkhala'iqi ajma`ina
and the argument against all of the creatures.