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.' "
Muwatta Malik Book 41, Hadith 8