The word(s) "backs" appears 31 time(s) in 28 verse(s) in Quran in Muhammad Habib Shakir translation.

(21) Yet they turned their backs on him and said: One taught (by others), a madman.

(22) Surely (as for) those who return on their backs after that guidance has become manifest to them, the Shaitan has made it a light matter to them; and He gives them respite.

(23) But how will it be when the angels cause them to die smiting their backs.

(24) And if those who disbelieve fight with you, they would certainly turn (their) backs, then they would not find any protector or a helper.

(25) Soon shall the hosts be routed, and they shall turn (their) backs.

(26) (As for) those of you who put away their wives by likening their backs to the backs of their mothers, they are not their mothers; their mothers are no others than those who gave them birth; and most surely they utter a hateful word and a falsehood and most surely Allah is Pardoning, Forgiving.

(27) And (as for) those who put away their wives by likening their backs to the backs of their mothers then would recall what they said, they should free a captive before they touch each other; to that you are admonished (to conform); and Allah is Aware of what you do.

(28) Certainly if these are driven forth, they will not go forth with them, and if they are fought against, they will not help them, and even if they help-them, they will certainly turn (their) backs, then they shall not be helped.