[The author of `Uyūn al-mu`jizāt says...
[The author of `Uyūn al-mu`jizāt says,] “This is a report on which the Shias, scholars, non-scholars, the Sunnis, the elite, the masses, the old, and the children are all unanimous and agree to due to its fame.” `Uyūn al-mu`jizāt[^11]: From Abū Sa`īd al-Khudrī, from the Messenger of Allah, Allah's blessings be on him and his family, who said: “I swear by the One in Whose Hands is my life!
The Mahdī of this umma—behind whom Jesus will pray—is from us; then, he patted the shoulder of Imam al-Ḥusayn with his hand and exclaimed, ‘From him, from him.’” Al-Tafḍīl[^12]: Some of the Shias and also some of the Sunni traditionists (muḥaddithīn) have recorded that When the Mahdī appears, Allah, the Exalted, will send down Jesus upon him and they will come together.
When the time of the compulsory prayers comes, the Mahdī will say to Jesus, “Come forward, O Spirit of Allah” suggesting that he should lead the prayers. The Christ will reply, “No one is allowed to precede you Ahl al-Bait.” So the Mahdī will go forward and the Christ will pray behind him, peace be on them both. Ḥāshiyatu fatḥ al-mubīn[^13]: One narration mentions that he will descend after the Mahdī has commenced the prayers. He will go back a bit so that Jesus may lead the prayers.
Jesus will place his hand between his shoulders and say to him, “You go ahead.” Before narrating this tradition [the author of the book] says, “His descent will occur at the time of the morning prayers.” Anwār al-tanzīl[^14]: It has been narrated that Jesus will descend at a mountain pass in the Holy Land called Afīq. In his hand will be a lance by which he will kill the Antichrist (al-Dajjāl). Then, he will come to Bait al-Maqdas while the people are busy with the morning prayers.
The Imam will withdraw but Jesus will stand back and will pray behind him in accordance with the sharia of Muḥammad, blessings and peace be on him. `Alī b. Burhān al-Dīn al-Ḥalabī al-Shāfi`ī writes in al-Sīrat al-Ḥalabiyya, “[Jesus’] descent will be at the time of the morning prayers.
He will pray behind the Mahdī after the Mahdī says to him, ‘Come forward, O Spirit of Allah!’ and he will answer, ‘You go ahead, for indeed, the prayers have been established for you.’” Similar to the above has been recorded in Rūḥ al-bayān under the saying of Allah, the Exalted, “And surely, it is a knowledge of the Hour” (Quran 43:61). Similar to it has also been mentioned in Tafsīr al-kashshāf.