ENOfficial
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.
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ اللَّهِ بْنِ الْمَيْمُونِ، حَدَّثَنَا الْوَلِيدُ، عَنِ الأَوْزَاعِيِّ، عَنْ عَمْرِو بْنِ شُعَيْبٍ، عَنْ أَبِيهِ، عَنْ جَدِّهِ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " إِذَا زَوَّجَ أَحَدُكُمْ عَبْدَهُ أَمَتَهُ فَلاَ يَنْظُرْ إِلَى عَوْرَتِهَا " .
sunnah.com