Maliks Muwatta Book 29, Hadith Number 97.
Section : Coitus Interruptus.
Yahya related to me from Malik from Abu’n-Nadr, the mawla of Umar ibn Ubaydullah from Ibn Aflah, the mawla of Abu Ayyub al-Ansari from an umm walad of Abu Ayyubal-Ansari that he practised coitus interruptus.