[This is] a blessed Book which We have revealed to you, [O Muhammad], that they (i.e. people) might reflect upon its verses and that those of understanding would be reminded. (Quran, 38:29)
This divine message was revealed to confirm and renew the relationship between man and his Creator and to reinstate the sincere and correct worship of the one true God, Allah, who says:

Then let them respond to Me and believe in Me that they may be [rightly] guided. (Quran, 2:186)

Gratitude helps us recognize other people’s favors to us
The Prophet through his sayings made it quite clear that expressing our gratitude to Allah by thanking Him also involves that we thank people who do favors for us. The Prophet Muhammad (peace be upon him) said as narrated by Abu Hurairah: “He who does not thank people, does not thank Allah” (Ahmad, Tirmidhi). He also said: “Whoever does you a favor, then reciprocate, and if you cannot find anything with which to reciprocate, then pray for him until you think that you have reciprocated him” Abu Dawood (1672). In another hadith, he said: “Whoever has a favor done for him and says to the one who did it, ‘Jazak Allahu khayran,’ has done enough to thank him” [Classed as saheeh by al-Albaani in Saheeh al-Tirmidhi]. Let’s therefore ensure that we do our part to sincerely thank our families and those who have done good to us.

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