Violations are mentioned in the Quran in these verses:

[48:10] Surely, those who pledge allegiance to you, are pledging allegiance to God. God approves their pledge; He places His hand above their hands. Those who violate such a pledge, commit the violation to their own detriment. As for those who fulfill their pledge with God, He will grant them a great recompense.

To learn more, read the Quran in English.

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