وَحَدَّثَنِي عَنْ مَالِكٍ، عَنِ ابْنِ شِهَابٍ، عَنْ عُرْوَةَ بْنِ الزُّبَيْرِ، أَنَّ خَوْلَةَ بِنْتَ حَكِيمٍ، دَخَلَتْ عَلَى عُمَرَ بْنِ الْخَطَّابِ فَقَالَتْ إِنَّ رَبِيعَةَ بْنَ أُمَيَّةَ اسْتَمْتَعَ بِامْرَأَةٍ فَحَمَلَتْ مِنْهُ ‏.‏ فَخَرَجَ عُمَرُ بْنُ الْخَطَّابِ فَزِعًا يَجُرُّ رِدَاءَهُ فَقَالَ هَذِهِ الْمُتْعَةُ وَلَوْ كُنْتُ تَقَدَّمْتُ فِيهَا لَرَجَمْتُ ‏.‏

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 ispregnant by him.'' Umar ibn al-Khattab went out in dismay dragging hiscloak, saying, "This temporary marriage, had I come across it, I wouldhave ordered stoning and done away with it! " Translation Not Available

Book Ref: Muwatta Imam Malik Book 28 Hadith 1137
Web Ref:  Muwatta Imam Malik Book 28 Hadith 42