Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) narrates: The Messenger of Allah (peace and blessings be upon him) passed by (somewhere), and the people began saying: "This is the Messenger of Allah." A Jew said: "If he (truly) is the Messenger of Allah, I will ask him about something; if he is a Prophet, he will know it." So he said: "O Abu al-Qasim, tell me: is a human being created from the man's fluid or from the woman's fluid?" He (peace and blessings be upon him) said: "The man's fluid is white and thick, and from it come the bones and the sinews; and the woman's fluid is yellow and thin, and from it come the blood and the flesh."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 10322