Yahya related to me from Malik from Ibn Shihab from Urwa ibn az- Zubayr that Khawla ibn Hakim came to Umar ibn al-Khattab and said, ''Rabia ibn Umayya made a temporary marriage with a woman and she is pregnant by him.'' Umar ibn al-Khattab went out in dismay dragging his cloak, saying, "This temporary marriage, had I come across it, I would have ordered stoning and done away with it! "

Muwatta Malik Book 28, Hadith 46