Piety is mentioned in the Quran in these verses:

[5:2] O you who believe, do not violate the rites instituted by God, nor the Sacred Months, nor the animals to be offered, nor the garlands marking them, nor the people who head for the Sacred Shrine (Ka`bah) seeking blessings from their Lord and approval. Once you complete the pilgrimage, you may hunt. Do not be provoked into aggression by your hatred of people who once prevented you from going to the Sacred Masjid. You shall cooperate in matters of righteousness and piety; do not cooperate in matters that are sinful and evil. You shall observe God. God is strict in enforcing retribution.

[5:93] Those who believe and lead a righteous life bear no guilt by eating any food, so long as they observe the commandments, believe and lead a righteous life, then maintain their piety and faith, and continue to observe piety and righteousness. God loves the righteous.

[58:9] O you who believe, if you have to confer secretly, you shall not confer to commit sin, transgression, and to disobey the messenger. You shall confer to work righteousness and piety. You shall reverence God, before whom you will be summoned.

To learn more, read the Quran in English.

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