Abu Dawud said: Khalid b. 'Abd Allah narrated this tradition direct from the Prophet (ﷺ). He did not mention the name of al-Sharid.
In-book : Book 22, Hadith 42
English translation : Book 21, Hadith 3277
22. Oaths and Vows (Kitab Al-Aiman Wa Al-Nudhur)
باب فِي الرَّقَبَةِ الْمُؤْمِنَةِ