The word(s) "behind" appears 57 time(s) in 56 verse(s) in Quran in Muhammad Habib Shakir translation.

(41) And when Our apostles came to Lut he was grieved on account of them, and he felt powerless (to protect) them; and they said: Fear not, nor grieve; surely we will deliver you and your followers, except your wife; she shall be of those who remain behind.

(42) O you who believe! do not enter the houses of the Prophet unless permission is given to you for a meal, not waiting for its cooking being finished-- but when you are invited, enter, and when you have taken the food, then disperse-- not seeking to listen to talk; surely this gives the Prophet trouble, but he forbears from you, and Allah does not forbear from the truth And when you ask of them any goods, ask of them from behind a curtain; this is purer for your hearts and (for) their hearts; and it does not behove you that you should give trouble to the Apostle of Allah, nor that you should marry his wives after him ever; surely this is grievous in the sight of Allah.

(43) Do they not then consider what is before them and what is behind them of the heaven and the earth? If We please We will make them disappear in the land or bring down upon them a portion from the heaven; most surely there is a sign in this for every servant turning (to Allah).

(44) And We have made before them a barrier and a barrier behind them, then We have covered them over so that they do not see.

(45) And when it is said to them: Guard against what is before you and what is behind you, that mercy may be had on you.

(46) When their apostles came to them from before them and from behind them, saying, Serve nothing but Allah, they said: If our Lord had pleased He would certainly have sent down angels, so we are surely unbelievers in that with which you are sent.

(47) And We have appointed for them comrades so they have made fair-seeming to them what is before them and what is behind them, and the word proved true against them-- among the nations of the jinn and the men that have passed away before them-- that they shall surely be losers.

(48) Falsehood shall not come to it from before it nor from behind it; a revelation from the Wise, the Praised One.

(49) And it is not for any mortal that Allah should speak to him except by revelation or from behind a veil, or by sending a messenger and revealing by His permission what He pleases; surely He is High, Wise.

(50) Those of the dwellers of the desert who were left behind will say to you: Our property and our families kept us busy, so ask forgiveness for us. They say with their tongues what is not in their hearts. Say: Then who can control anything for you from Allah if He intends to do you harm or if He intends to do you good; nay, Allah is Aware of what you do: