The word(s) "guard" appears 60 time(s) in 55 verse(s) in Quran in Muhammad Pickthal translation.

(41) Lo! men who surrender unto Allah, and women who surrender, and men who believe and women who believe, and men who obey and women who obey, and men who speak the truth and women who speak the truth, and men who persevere (in righteousness) and women who persevere, and men who are humble and women who are humble, and men who give alms and women who give alms, and men who fast and women who fast, and men who guard their modesty and women who guard (their modesty), and men who remember Allah much and women who remember - Allah hath prepared for them forgiveness and a vast reward.

(42) O ye who believe! guard your duty to Allah, and speak words straight to the point;

(43) They will say: Be Thou Glorified. Thou (alone) art our guardian, not them! Nay, but they worshipped the jinn; most of them were believers in them.

(44) Allah is Creator of all things, and He is guardian over all things.

(45) And those in the Fire say unto the guards of hell: Entreat your Lord that He relieve us of a day of the torment.

(46) And as for those who choose protecting friends beside Him, Allah is Warden over them, and thou art in no wise a guardian over them.

(47) O our people! respond to Allah's summoner and believe in Him. He will forgive you some of your sins and guard you from a painful doom.

(48) Fair ones, close-guarded in pavilions -

(49) He is Allah, than Whom there is no other Allah, the Sovereign Lord, the Holy One, Peace, the Keeper of Faith, the guardian, the Majestic, the Compeller, the Superb. Glorified be Allah from all that they ascribe as partner (unto Him).

(50) Save unto every messenger whom He hath chosen, and then He maketh a guard to go before him and a guard behind him