Heels are mentioned in the Quran in these verses:

[2:143] We thus made you an impartial community, that you may serve as witnesses among the people, and the messenger serves as a witness among you. We changed the direction of your original Qiblah only to distinguish those among you who readily follow the messenger from those who would turn back on their heels. It was a difficult test, but not for those who are guided by God. God never puts your worship to waste. God is Compassionate towards the people, Most Merciful.

[3:144] Muhammad was no more than a messenger like the messengers before him. Should he die or get killed, would you turn back on your heels? Anyone who turns back on his heels, does not hurt God in the least. God rewards those who are appreciative.

[3:149] O you who believe, if you obey those who disbelieve, they will turn you back on your heels, then you end up losers.

[6:71] Say, “Shall we implore, beside God, what possesses no power to benefit us or hurt us, and turn back on our heels after God has guided us? In that case, we would join those possessed by the devils, and rendered utterly confused, while their friends try to save them: `Stay with us on the right path.’ ” Say, “God’s guidance is the right guidance. We are commanded to submit to the Lord of the universe.

[8:48] The devil had adorned their works in their eyes, and said, “You cannot be defeated by any people today,” and “I will be fighting along with you.” But as soon as the two armies faced each other, he turned back on his heels and fled, saying, “I disown you. I see what you do not see. I am afraid of God. God’s retribution is awesome.”

[23:66] My proofs have been presented to you, but you turned back on your heels.

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