The word(s) "back" appears 161 time(s) in 150 verse(s) in Quran in Mohsin Khan translation.

(51) And say (O Muhammad صلى الله عليه وسلم) "Do deeds! Allah will see your deeds, and (so will) His Messenger and the believers. And you will be brought back to the All-Knower of the unseen and the seen. Then He will inform you of what you used to do."

(52) There! Every person will know (exactly) what he had earned before and they will be brought back to Allah, their rightful Maula (Lord), and their invented false deities will vanish from them.

(53) And if We delay the torment for them till a determined term, they are sure to say, "What keeps it back?" Verily, on the day it reaches them, nothing will turn it away from them, and they will be surrounded by (or fall in) that at which they used to mock!

(54) "O Ibrahim (Abraham)! Forsake this. Indeed, the Commandment of your Lord has gone forth. Verily, there will come a torment for them which cannot be turned back."

(55) They (messengers) said: "O Lut (Lot)! Verily, we are the messengers from your Lord! They shall not reach you! So travel with your family in a part of the night, and let not any of you look back; but your wife (will remain behind), verily, the punishment which will afflict them, will afflict her. Indeed, morning is their appointed time. Is not the morning near?"

(56) He said: "O my people! Is then my family of more weight with you than Allah? And you have cast Him away behind your backs. Verily, my Lord is surrounding all that you do.

(57) So they raced with one another to the door, and she tore his shirt from the back. They both found her lord (i.e. her husband) at the door. She said: "What is the recompense (punishment) for him who intended an evil design against your wife, except that he be put in prison or a painful torment?"

(58) "But if it be that his shirt is torn from the back, then she has told a lie and he is speaking the truth!"

(59) So when he (her husband) saw his [(Yusuf's (Joseph)] shirt torn at the back, he (her husband) said: "Surely, it is a plot of you women! Certainly mighty is your plot!

(60) And [Yusuf (Joseph)] told his servants to put their money (with which they had bought the corn) into their bags, so that they might know it when they go back to their people; in order they might come again.