Narrated 'Amr b. Suh'aib:

On his father's authority, said that his grandfather reported the Prophet ﷺ said: When one of you marries his male-slave to his slave-woman, he should not look at her private parts.

حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ اللَّهِ بْنِ الْمَيْمُونِ، حَدَّثَنَا الْوَلِيدُ، عَنِ الأَوْزَاعِيِّ، عَنْ عَمْرِو بْنِ شُعَيْبٍ، عَنْ أَبِيهِ، عَنْ جَدِّهِ، عَنِ النَّبِيِّ ﷺ قَالَ
" إِذَا زَوَّجَ أَحَدُكُمْ عَبْدَهُ أَمَتَهُ فَلاَ يَنْظُرْ إِلَى عَوْرَتِهَا " .