Sahih Muslim | Book 8 | Hadith Number 3379

Narrated by Ma'bad b. Sirin
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)