Sunan Abi Dawud 5169
سنن أبي داود#5169Sahih‘Abd Allah b. ‘Umar reported the Messenger of Allah (May peace be upon him) as saying:when a slave acts sincerely towards his master and worship Allah well, he will have a double reward
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Zubair Ali ZaiSahih Bukhari (2546) Sahih Muslim (1664)
In-book reference: 43:397