5. "Our Lord! we believe in what You have revealed and we follow the apostle, so write us down with those who bear witness." [3:53]

رَبَّنَا آمَنَّا بِمَا أَنزَلْتَ وَاتَّبَعْنَا الرَّسُولَ فَاكْتُبْنَا مَعَ الشَّاهِدِي○

Whose prayer is this?

السلام عليكم ورحمة الله وبركاتة       

ﺑِﺴْـــــــﻢِﷲِﺍﻟﺮَّﺣْﻤَﻦِﺍلرَّﺣِﻴﻢ

Answer:

Prayer of the disciples (Hawariun) of Isa ibn Marium (AS).

Explanation:

If a man, establishes salah, keeps his fast and performs all duties of a good Muslim, he is merely on the level of service and subjection to Allahuthala. The same man when he strives hard to spread religion and tries hard to reach zenith of his spirituality, he is honoured with the status of Allah's ally and helper. Isa ibn Marium (AS) had few such helpers called Hawariun.

Isa ibn Marium (AS) said to his people:

"And [I have come] confirming what was before me of the Torah and to make lawful for you some of what was forbidden to you. And I have come to you with a sign from your Lord, so fear Allāh and obey me [3:50]

Indeed, Allāh is my Lord and your Lord, so worship Him.That is the straight path.'" [3:51].

But when Isa ibn Marium (AS) felt [persistence in] disbelief from them, he asked, "Who are my supporters for [the cause of] Allah?" The disciples said, "We are supporters for Allah. We have believed in Allah and testify that we are Muslims  [submitting to Him].

Then they are invoked to the Lord this supplication.

الحمدلله