Sahih Muslim Book 025, Hadith Number 5352.

Chapter : Permissibility of calling one as ,My son." besides one's own son.

Mughira b. Shu'ba reported that none else had asked more questions from Allah's Messenger (may peace be upon him) about the Dajjal than I, but he simply said in a slight mood): O, my son, why are you worried because of him? He will not harm you. I said: The people think that he would have with him rivers of water and mountains of bread, whereupon he said: He would be more insignificant in the sight of Allah than all these things (belonging to him).