Peace, one and all…
Imam Ali ibn Hussein Zain al-Abidin (may Allah bless him) wrote a collection of beautiful and profound prayers, known as Sahifa al-Sajjadiyya. Within that collection (which you can find online) are a number of duas (supplications) for each day of the week. Here is the dua for friday (yaum al-jumuah), which has been beautifully recited.
Here is the text.
In the Name of God, the All-Merciful, the All-compassionate
‘1. All Praise belongs to God, the First before the bringing forth and the giving of life, and the Last after the annihilation of all things, the All-knowing who forgets not him who remembers Him, decreases not him who thanks Him, disappoints not him who supplicates Him, and cuts not off the hope of him who hopes in Him! 2 O God, I call Thee to witness – and Thou art sufficient witness – and I call to witness all Thy angels, the inhabitants of Thy heavens, the bearers of Thy Throne, Thy prophets and Thy messengers whom Thou hast sent out, and the various kinds of creatures Thou hast brought forth, that I bear witness that Thou art God; there is no god but Thou, Thou alone, who hast no associate nor any equal, and Thy word has no failing, nor any change; and that Muhammad (God bless him and his Household) is Thy servant and Thy messenger; he delivered to the servants that with which Thou charged him, he struggled for God as is His due, he gave the good news of the truth of reward, and he warned of the veracity of punishment. 3 O God, make me firm in Thy religion as long as Thou keepest me alive, make not my heart to swerve after Thou hast guided me, and give me mercy from Thee, surely Thou art the Giver. Bless Muhammad and the Household of Muhammad, make me one of his followers and his partisans, muster me in his band, and give me the success of accomplishing the obligatory observance of Friday, performing the acts of obedience which Thou has made incumbent upon me within it, and [receiving] the bestowal which Thou hast apportioned for its people on the Day of Recompense! Surely Thou art Mighty, All-wise!’