The word(s) "guard" appears 80 time(s) in 76 verse(s) in Quran in Abdullah Yusuf Ali translation.

(31) "Turn ye back to your father, and say, 'O our father! behold! thy son committed theft! we bear witness only to what we know, and we could not well guard against the unseen!

(32) For each (such person) there are (angels) in succession, before and behind him: They guard him by command of Allah. Allah does not change a people's lot unless they change what is in their hearts. But when (once) Allah willeth a people's punishment, there can be no turning it back, nor will they find, besides Him, any to protect.

(33) We have, without doubt, sent down the Message; and We will assuredly guard it (from corruption).

(34) And (moreover) We have guarded them from every cursed devil:

(35) And We send the fecundating winds, then cause the rain to descend from the sky, therewith providing you with water (in abundance), though ye are not the guardians of its stores.

(36) Such is the Garden which We give as an inheritance to those of Our servants who guard against Evil.

(37) But We shall save those who guarded against evil, and We shall leave the wrong-doers therein, (humbled) to their knees.

(38) And We have made the heavens as a canopy well guarded: yet do they turn away from the Signs which these things (point to)!

(39) Or have they gods that can guard them from Us? They have no power to aid themselves, nor can they be defended from Us.

(40) It was We Who taught him the making of coats of mail for your benefit, to guard you from each other's violence: will ye then be grateful?