(2) Prayer (Kitab Al-Salat)
كتاب الصلاة
(175) Chapter: When A Boy Should Be Ordered To Offer As-Salat
(26) باب مَتَى يُؤْمَرُ الْغُلاَمُ بِالصَّلاَةِ
Sunan Abi Dawud 496 

This tradition has been narrated by Dawud b. Sawar al-Muzani through a different chain of transmitters and to the same effect. This version adds; if any of you marries his slave-girl to his male-slave or his servant, he should not look at her private part below her navel and above her knees.

Abu Dawud said:

Waki' misunderstood the name of Dawud b. Sawar. Abu Dawud al-Tayalisi has narrated this tradition from him. He said: Anu Hamzah Sawar al-Sairafi.

حَدَّثَنَا زُهَيْرُ بْنُ حَرْبٍ، حَدَّثَنَا وَكِيعٌ، حَدَّثَنِي دَاوُدُ بْنُ سَوَّارٍ الْمُزَنِيُّ، بِإِسْنَادِهِ وَمَعْنَاهُ وَزَادَ ‏ "‏ وَإِذَا زَوَّجَ أَحَدُكُمْ خَادِمَهُ عَبْدَهُ أَوْ أَجِيرَهُ فَلاَ يَنْظُرْ إِلَى مَا دُونَ السُّرَّةِ وَفَوْقَ الرُّكْبَةِ ‏"‏ ‏.‏ قَالَ أَبُو دَاوُدَ وَهِمَ وَكِيعٌ فِي اسْمِهِ وَرَوَى عَنْهُ أَبُو دَاوُدَ الطَّيَالِسِيُّ هَذَا الْحَدِيثَ فَقَالَ حَدَّثَنَا أَبُو حَمْزَةَ سَوَّارٌ الصَّيْرَفِيُّ ‏.‏
Grade :  Hasan (Al-Albani) حسن  (الألباني)حكم :
Reference : Sunan Abi Dawud 496
In-book reference : Book 2, Hadith 106
English translation : Book 2, Hadith 496