2 verses have
backs
in Edition Clear Qur'an by Talal Itani / Aal-i-Imraan (The Family of Imraan)

3:155Those of you who turned back on the day when the two armies clashed—it was Satan who caused them to backslide, on account of some of what they have earned. But God has forgiven them. God is Forgiving and Prudent.

3:187God received a pledge from those who were given the Scripture: “You shall proclaim it to the people, and not conceal it.” But they disregarded it behind their backs, and exchanged it for a small price. What a miserable exchange they made.