Maliks Muwatta Book 41, Hadith Number 8.

Section : Stoning.

Malik related to me from Ibn Shihab from Ubaydullah ibn Abdullah ibn Utba ibn Masud that Abdullah ibn Abbas said, “I heard Umar ibn al-Khattab say, ‘Stoning is in the Book of Allah for those who commit adultery, men or women when they are muhsan and when there is clear proof of pregnancy or a confession.'”