The Shaykh : Then he says: "The chapter on the one to whom a favor is done, let him reward it." He narrated with his chain of narration from Jabir ibn 'Abd Allah al-Ansari who said:

The Shaykh: Then he says: "The chapter on the one to whom a favor is done, let him reward it." He narrated with his chain of narration from Jabir ibn 'Abd Allah al-Ansari who said: The Prophet (peace and blessings be upon him) said: .
In this hadith is one of the Islamic etiquettes that every Muslim must adopt, where the Messenger (peace and blessings be upon him) said: ; meaning that whenever a Muslim is treated well by a benefactor, he should reward him with some reward. The one who is rewarded must reciprocate the reward with a similar reward. If he is rewarded with money, he rewards him with money; if he is rewarded with service, he rewards him with service. That is, he reciprocates good with good. He should not be selfish, demanding that people serve him and reward him with good, while he does not reciprocate their kindness with similar kindness. This is not part of the etiquette of Islam. Rather, Islam says, as you heard in the hadith of the Messenger (peace and blessings be upon him): . As he (peace and blessings be upon him) said in another hadith: . Then the Messenger (peace and blessings be upon him) speaks about the situation where the one who is rewarded does not find what to reward the benefactor with, and he says: . This is the way to reciprocate the reward with a similar reward when the one who is rewarded is unable to reciprocate the reward with a similar reward. In that case, he must praise him with good. That is, if a man gives a gift to a person, any material thing, and the recipient is unable to reciprocate the gift with a similar gift, then at least the Messenger (peace and blessings be upon him) says: . That is, let him mention the one who treated him well and gave him the gift with good, and let him praise him with good. The explanation of this praise that the Messenger (peace and blessings be upon him) commanded, and how it is to be done, came in another hadith, where he (peace and blessings be upon him) said: . In this hadith narrated by the author (may Allah have mercy on him), the command to praise is for whom? For the one who treated you well or gave you a gift. This command comes in the second stage, as per the text of the hadith. The first stage is to reciprocate the reward with a reward. If you cannot, you reciprocate the reward with praise, with beautiful and good words. The best thing in this reward, which is praise, is what was explained in the other hadith, namely his saying (peace and blessings be upon him): .
So here there are two stages, one better than the other. The first is to reciprocate the reward with a similar reward, whether it is spiritual or material. If you are unable to reciprocate the reward with a reward, then you praise with good the one who presented that reward to you. Any good words that make the one who rewarded you feel that you accepted this reward with a good and satisfied heart, and you reciprocate that by praising the one who rewarded you. But the best thing for the one who praises the benefactor with good is the phrase "May Allah reward you with good." It should be mentioned on this occasion that a custom has recently emerged, considered one of the social etiquettes, where the one who is treated well reciprocates the benefactor with the word "Thank you." The least thing a person does with another is that the other says "Thank you" to the one who was treated well. What I want to point out is that there is nothing wrong with this word, because shortly, from the hadiths of the book, will come his saying (peace and blessings be upon him): . So if someone treats you well and you say "Thank you" to him, you have applied this coming hadith, which is his saying (peace and blessings be upon him): . But we must know that using this word, "Thank you," is a substitute for what the Messenger (peace and blessings be upon him) taught us of supplicating for good, which was mentioned before, namely our saying: "May Allah reward you with good." This phrase is better than the word "Thank you" in two ways. The first way is that the Messenger (peace and blessings be upon him) mentioned that the saying of the one who says: "May Allah reward you with good" is the most eloquent praise . So if the one says "Thank you," he has not expressed the most eloquent praise. It is true that he thanked the one who was treated well and acted in accordance with his saying (peace and blessings be upon him): . But he did not act in accordance with the other hadith, which is his saying (peace and blessings be upon him): . So we must use this phrase, "May Allah reward you with good," as a substitute for "Thank you," as long as the Messenger (peace and blessings be upon him) mentioned it and described it as the most eloquent praise.