The word(s) "backed" appears 3 time(s) in 3 verse(s) in Quran in Muhammad Habib Shakir translation.

(1) Except those of the idolaters with whom you made an agreement, then they have not failed you in anything and have not backed up any one against you, so fulfill their agreement to the end of their term; surely Allah loves those who are careful (of their duty).

(2) And He drove down those of the followers of the Book who backed them from their fortresses and He cast awe into their hearts; some you killed and you took captive another part.

(3) Allah only forbids you respecting those who made war upon you on account of (your) religion, and drove you forth from your homes and backed up (others) in your expulsion, that you make friends with them, and whoever makes friends with them, these are the unjust.