Verse Quran
2:264 O ye who believe! cancel not your charity by reminders of your generosity or by injury,- like those who spend their substance to be seen of men, but believe neither in Allah nor in the Last Day. They are in parable like a hard, barren rock, on which is a little soil: on it falls heavy rain, which leaves it (Just) a bare stone. They will be able to do nothing with aught they have earned. And Allah guideth not those who reject faith.
49:17 They impress on thee as a favour that they have embraced Islam. Say, "Count not your Islam as a favour upon me: Nay, Allah has conferred a favour upon you that He has guided you to the faith, if ye be true and sincere.

The Quran's Verse about gratefulness

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