Muwatta Malik #1204
Marriage
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ أَبِي الزُّبَيْرِ الْمَكِّيِّ، أَنَّ رَجُلاً، خَطَبَ إِلَى رَجُلٍ أُخْتَهُ فَذَكَرَ أَنَّهَا قَدْ كَانَتْ أَحْدَثَتْ فَبَلَغَ ذَلِكَ عُمَرَ بْنَ الْخَطَّابِ فَضَرَبَهُ - أَوْ كَادَ يَضْرِبُهُ - ثُمَّ قَالَ مَا لَكَ وَلِلْخَبَرِ
Yahya related to me from Malik from Abu'z-Zubayr al-Makki that
somebody asked a man for his sister in marriage and the man mentioned
that she had committed fornication. Umar ibn al-Khattab heard about it
and he beat the man or almost beat him, and said, "What did you mean
by giving him such information?"
About Muwatta Malik
This hadith is #1204 from Muwatta Malik, in the Book of Marriage.