Sahih Muslim Book 8, Hadith Number 3379.
Chapter: Al-Azl (incomplete sexual intercourse): Coitus Interruptus.
Ma’bad b. Sirin said to Abu Sa’id (Allah be pleased with him): Did you hear Allah’s Messenger (May peace be upon him) making a mention of something in regard to al-‘azl? Thereupon he said: Yes. The rest (of the hadith is the same)