Boasting is mentioned in the Quran in these verses:
[26:22] “You are boasting that you did me a favor, while enslaving the Children of Israel!”
[57:20] Know that this worldly life is no more than play and games, and boasting among you, and hoarding of money and children. It is like abundant rain that produces plants and pleases the disbelievers. But then the plants turn into useless hay, and are blown away by the wind. In the Hereafter there is either severe retribution, or forgiveness from God and approval. This worldly life is no more than a temporary illusion.
To learn more, read the Quran in English.
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