2 verses have
“back”
in Edition Clear Qur'an by Talal Itani / Al-Maaida (The Table)
5:21“O my people, enter the Holy Land which God has assigned for you, and do not turn back, lest you return as losers.”
5:54O you who believe! Whoever of you goes back on his religion—God will bring a people whom He loves and who love Him, kind towards the believers, stern with the disbelievers. They strive in the way of God, and do not fear the blame of the critic. That is the grace of God; He bestows it upon whomever He wills. God is Embracing and Knowing.
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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