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

(61) Like unto Pearls well-guarded.

(62) In Book well-guarded,

(63) Allah is He, than Whom there is no other god;- the Sovereign, the Holy One, the Source of Peace (and Perfection), the guardian of Faith, the Preserver of Safety, the Exalted in Might, the Irresistible, the Supreme: Glory to Allah! (High is He) above the partners they attribute to Him.

(64) O ye who believe! When there come to you believing women refugees, examine (and test) them: Allah knows best as to their Faith: if ye ascertain that they are Believers, then send them not back to the Unbelievers. They are not lawful (wives) for the Unbelievers, nor are the (Unbelievers) lawful (husbands) for them. But pay the Unbelievers what they have spent (on their dower), and there will be no blame on you if ye marry them on payment of their dower to them. But hold not to the guardianship of unbelieving women: ask for what ye have spent on their dowers, and let the (Unbelievers) ask for what they have spent (on the dowers of women who come over to you). Such is the command of Allah: He judges (with justice) between you. And Allah is Full of Knowledge and Wisdom.

(65) And Mary the daughter of 'Imran, who guarded her chastity; and We breathed into (her body) of Our spirit; and she testified to the truth of the words of her Lord and of His Revelations, and was one of the devout (servants).

(66) And those who guard their chastity,

(67) And those who guard (the sacredness) of their worship;-

(68) 'And we pried into the secrets of heaven; but we found it filled with stern guards and flaming fires.

(69) Then how shall ye, if ye deny (Allah), guard yourselves against a Day that will make children hoary-headed?-

(70) And We have set none but angels as guardians of the Fire; and We have fixed their number only as a trial for Unbelievers,- in order that the People of the Book may arrive at certainty, and the Believers may increase in Faith,- and that no doubts may be left for the People of the Book and the Believers, and that those in whose hearts is a disease and the Unbelievers may say, "What symbol doth Allah intend by this?" Thus doth Allah leave to stray whom He pleaseth, and guide whom He pleaseth: and none can know the forces of thy Lord, except He and this is no other than a warning to mankind.