"There are three things for which I swear and narrate to you about, so remember it." He said: "The wealth of a slave (of Allah) shall not be decreased by charity, no slave (of Allah) suffers injustice and is patient with it except that Allah adds to his honor; no slave (of Allah) opens up a door to begging except that Allah opens a door for him to poverty"- or a statement similar- "And I shall narrate to you a narration, so remember it." He said: "The world is only for four persons: A slave whom Allah provides with wealth and knowledge, so he has Taqwa of his Lord with it, nurtures the ties of kinship with it, and he knows that Allah has a right in it. So this is the most virtuous rank. And a slave whom Allah provides with knowledge, but He does not provide with wealth. So he has a truthful intent, saying: 'If I had wealth, then I would do the deeds of so-and-so with it.' He has his intention, so their rewards are the same. And a slave whom Allah provides with wealth, but He does not provide him with knowledge. spends his wealth rashly without knowledge, nor having Taqwa of his Lord, nor nurturing the ties of kinship, and he does not know that Allah has a right in it. So this is the most despicable rank. And a slave whom Allah does not provide with wealth nor knowledge, so he says: 'If I had wealth, then I would do the deeds of so-and-so with it.' He has his intention, so their sin is the same."

Allah's Messenger (ﷺ) said, "Not to wish to be the like of except the like of two men: a man whom Allah has given the Qur'an and he recites it during the hours of the night and the hours of the day, in which case one may say, "If I were given the same as this man has been given, I would do the same as he is doing.' The other is a man whom Allah has given wealth and he spends it in the right way, in which case one may say, 'If I were given the same as he has been given, I would do the same as he is doing."

“The Messenger of Allah (ﷺ) said: ‘The likeness of this nation is that of four people: A man to whom Allah gives wealth and knowledge, so he acts according to his knowledge with regard to his wealth, spending it as it should be spent; a man to whom Allah gives knowledge, but he does not give him wealth, so he says: “If I had been given (wealth) like this one, I would have done what (the first man) did.” The Messenger of Allah (ﷺ) said: ‘They will be equal in reward. And a man to whom Allah gives wealth but does not give knowledge, so he squanders his wealth and spends it in inappropriate ways; and a man to whom Allah gives neither knowledge nor wealth, and he says: “If I had (wealth) like this one, I would do what (the third man) did.” The Messenger of Allah (ﷺ) said: ‘They are equal in their burden (of sin).’” A similar report (as above) was narrated from Ibn Abu Kabshah, from his father, from the Prophet (ﷺ).

"How wonderful it is for one of them that he obeys Allah and fulfills the rights of his master." Meaning the slave. And Ka'b said: "Allah and His Messenger spoke the truth."

It is good for a slave that he worships Allah well, and serves his master (well). It is good for him.