question #1 Sahih al-Bukhari 2551, Book 49, Hadith 34 : What are the characteristics of a slave that lead to receiving a double reward in Islam?

The Prophet (ﷺ) said, “The Mamluk (slave) who worships his Lord in a perfect manner, and is dutiful,
sincere and obedient to his Saiyid (master), will get a double reward.”