question #3 Sahih al-Bukhari 3446, Book 60, Hadith 116 : What is the significance of a slave fearing Allah and obeying their master in terms of spiritual reward?

Allah’s Messenger (ﷺ) said, “If a person teaches his slave girl good manners properly, educates her properly,
and then manumits and marries her, he will get a double reward. And if a man believes in Jesus and
then believes in me, he will get a double reward. And if a slave fears his Lord (i.e. Allah) and obeys
his masters, he too will get a double reward.”