Sunan Abu Dawud Book 37, Number 4310:

Narrated Abu Huraira:

The Prophet (pbuh) said: There is no prophet between me and him, that is, Jesus (pbuh). He will descend (to the earth). When you see him, recognize him: a man of medium height, reddish fair, wearing two light yellow garments, looking as if drops were falling down from his head though it will not be wet. He will fight the people for the cause of Islam. He will break the cross, kill swine, and abolish jizya. Allah will perish all religions except Islam. He will destroy the Antichrist and will live on the earth for forty years and then he will die. The Muslims will pray over him.

Al-Husayn Al-Ajiri reports:
“ The traditions of al-Mustafa (S) on the rising of al-Mahdi has been transmitted via numerous authorities and is more than the level of (being sufficient for) Mutawatir, describing that he is of his Ahlul-Bayt, and will fill the earth with justice, and that Jesus (as) will come at the same time and he will assist Jesus for killing al-Dajjal in the land of Palestine, and that he will lead this nation and Jesus will pray behind him.

1. Jump up^ Ibn Hajar al-Haytami. Al-Sawa'iq al-Muhriqah. p. 254, Ch. 11, section 1.