The word(s) "back" appears 225 time(s) in 216 verse(s) in Quran in Abdullah Yusuf Ali translation.

(121) "My Signs used to be rehearsed to you, but ye used to turn back on your heels-

(122) And He has multiplied you through the earth, and to Him shall ye be gathered back.

(123) (In Falsehood will they be) Until, when death comes to one of them, he says: "O my Lord! send me back (to life),-

(124) "Did ye then think that We had created you in jest, and that ye would not be brought back to Us (for account)?"

(125) On that Day Allah will pay them back (all) their just dues, and they will realise that Allah is the (very) Truth, that makes all things manifest.

(126) If ye find no one in the house, enter not until permission is given to you: if ye are asked to go back, go back: that makes for greater purity for yourselves: and Allah knows well all that ye do.

(127) Be quite sure that to Allah doth belong whatever is in the heavens and on earth. Well doth He know what ye are intent upon: and one day they will be brought back to Him, and He will tell them the truth of what they did: for Allah doth know all things.

(128) "Now do thou throw thy rod!" But when he saw it moving (of its own accord) as if it had been a snake, he turned back in retreat, and retraced not his steps: "O Moses!" (it was said), "Fear not: truly, in My presence, those called as messengers have no fear,-

(129) "Go thou, with this letter of mine, and deliver it to them: then draw back from them, and (wait to) see what answer they return"...

(130) "Go back to them, and be sure we shall come to them with such hosts as they will never be able to meet: We shall expel them from there in disgrace, and they will feel humbled (indeed)."