Truthfulness is mentioned in the Quran in these verses:

[5:119] God will proclaim, “This is a day when the truthful will be saved by their truthfulness.” They have deserved gardens with flowing streams. They abide therein forever. God is pleased with them, and they are pleased with Him. This is the greatest triumph.

[33:8] Subsequently, He will surely question the truthful about their truthfulness, and has prepared for the disbelievers (in this Quranic fact) a painful retribution.

[33:24] God will surely recompense the truthful for their truthfulness, and will punish the hypocrites, if He so wills, or redeem them. God is Forgiver, Most Merciful.

To learn more, read the Quran in English.

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