The word(s) "behind" appears 62 time(s) in 60 verse(s) in Quran in Muhammad Pickthal translation.

(51) Those who were left behind will say, when ye set forth to capture booty: Let us go with you. They fain would change the verdict of Allah. Say (unto them, O Muhammad): Ye shall not go with us. Thus hath Allah said beforehand. Then they will say: Ye are envious of us. Nay, but they understand not, save a little.

(52) Say unto those of the wandering Arabs who were left behind: Ye will be called against a folk of mighty prowess, to fight them until they surrender; and if ye obey, Allah will give you a fair reward; but if ye turn away as ye did turn away before, He will punish you with a painful doom.

(53) Lo! those who call thee from behind the private apartments, most of them have no sense.

(54) And We left behind therein a portent for those who fear a painful doom.

(55) They will not fight against you in a body save in fortified villages or from behind walls. Their adversity among themselves is very great. Ye think of them as a whole whereas their hearts are divers. That is because they are a folk who have no sense.

(56) Save unto every messenger whom He hath chosen, and then He maketh a guard to go before him and a guard behind him

(57) On that day man is told the tale of that which he hath sent before and left behind.

(58) Lo! these love fleeting life, and put behind them (the remembrance of) a grievous day.

(59) A soul will know what it hath sent before (it) and what left behind.

(60) But whoso is given his account behind his back,