The word(s) "backs" appears 26 time(s) in 25 verse(s) in Quran in Abdullah Yusuf Ali translation.

(11) He said: "O my people! is then my family of more consideration with you than Allah? For ye cast Him away behind your backs (with contempt). But verily my Lord encompasseth on all sides all that ye do!

(12) And We put coverings over their hearts (and minds) lest they should understand the Qur'an, and deafness into their ears: when thou dost commemorate thy Lord and Him alone in the Qur'an, they turn on their backs, fleeing (from the Truth).

(13) If only the Unbelievers knew (the time) when they will not be able to ward off the fire from their faces, nor yet from their backs, and (when) no help can reach them!

(14) "And by Allah, I have a plan for your idols - after ye go away and turn your backs"..

(15) So verily thou canst not make the dead to hear, nor canst thou make the deaf to hear the call, when they show their backs and turn away.

(16) And yet they had already covenanted with Allah not to turn their backs, and a covenant with Allah must (surely) be answered for.

(17) "A Day when ye shall turn your backs and flee: No defender shall ye have from Allah: Any whom Allah leaves to stray, there is none to guide...

(18) In order that ye may sit firm and square on their backs, and when so seated, ye may celebrate the (kind) favour of your Lord, and say, "Glory to Him Who has subjected these to our (use), for we could never have accomplished this (by ourselves),

(19) But how (will it be) when the angels take their souls at death, and smite their faces and their backs?

(20) If the Unbelievers should fight you, they would certainly turn their backs; then would they find neither protector nor helper.