1 verse has
“backs”
in Edition Clear Qur'an by Talal Itani / Al-Ahzaab (The Clans)
33:15Although they had made a pledged to God, in the past, that they will not turn their backs. A pledge to God is a responsibility.
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Those who spend their wealth by night and day, privately and publicly, will receive their reward from their Lord. They have nothing to fear, nor shall they grieve.
The Holy Quran · Al-Baqara (The Cow) · 2:274