Sayyiduna Anas bin Malik (may Allah be pleased with him) relates that Sayyiduna Abdullah bin Salam (may Allah be pleased with him) said: O Messenger of Allah, I have become a Muslim, and I would like to ask you about some things. He (peace and blessings be upon him) said: "Ask whatever you wish." I said: O Messenger of Allah, tell me why a child resembles his mother when the seed comes from the man. He (peace and blessings be upon him) said: "The man's fluid is white and thick and the woman's fluid is red and thin; whichever of the two prevails, the child resembles it." I said: O Messenger of Allah, what will the people of Paradise eat when they enter it? He (peace and blessings be upon him) said: "The caudate lobe of a fish's liver." I said: O Messenger of Allah, tell me about the signs of the Hour. He (peace and blessings be upon him) said: "A fire that will come out from the east and drive people to their place of gathering." (On hearing this) Sayyiduna Abdullah bin Salam (may Allah be pleased with him) said: I bear witness that you are the Prophet of Allah.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 13962