Musannaf Ibn Abi Shayba 37:389

Ali ibn Mushir narrated to us, from al-Shaybani, from Hassan ibn al-Mukhariq, from Ammar ibn al-Mughirah, from Abu Hurayrah, who said: "Indeed, the mosques will be renewed for the emergence of the Messiah. He will emerge, and he will break the cross, kill the swine, and whoever reaches him will believe in him. So whoever among you reaches him, let him convey my greeting to him." Then he turned to me and said: "O son of my brother, I see that you are among the youngest of the people, so if you reach him, convey my greeting to him."