Muwatta Imam Malik Book of Marriage, Hadith 36

Yahya related to me from Malik that he had heard that Umar ibn al-Khattab gave his son a slave-girl and said, "Do not touch her, for I have uncovered her."

حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ عُمَرَ بْنَ الْخَطَّابِ، وَهَبَ لاِبْنِهِ جَارِيَةً فَقَالَ لاَ تَمَسَّهَا فَإِنِّي قَدْ كَشَفْتُهَا .