The word(s) "once" appears 105 time(s) in 102 verse(s) in Quran in Mohsin Khan translation.

(21) To Allah belongs all that is in the heavens and all that is on the earth, and whether you disclose what is in your ownselves or conceal it, Allah will call you to account for it. Then He forgives whom He wills and punishes whom He wills. And Allah is Able to do all things.

(22) Then whoever disputes with you concerning him ['Îsa (Jesus)] after (all this) knowledge that has come to you [i.e. 'Îsa (Jesus) being a slave of Allah, and having no share in Divinity], say: (O Muhammad صلى الله عليه وسلم) "Come, let us call our sons and your sons, our women and your women, ourselves and yourselves - then we pray and invoke (sincerely) the Curse of Allah upon those who lie."

(23) Verily, you are those who have disputed about that of which you have knowledge. Why do you then dispute concerning that of which you have no knowledge? It is Allah Who knows, and you know not.

(24) O people of the Scripture (Jews and Christians): "Why do you mix truth with falsehood and conceal the truth while you know?"

(25) O you who believe! Take not as (your) Bitanah (advisors, consultants, protectors, helpers, friends) those outside your religion (pagans, Jews, Christians, and hypocrites) since they will not fail to do their best to corrupt you. They desire to harm you severely. Hatred has already appeared from their mouths, but what their breasts conceal is far worse. Indeed We have made plain to you the Ayat (proofs, evidence, verses) if you understand.

(26) And that He might test the hypocrites, it was said to them: "Come, fight in the Way of Allah or (at least) defend yourselves." They said: "Had we known that fighting will take place, we would certainly have followed you." They were that day, nearer to disbelief than to Faith, saying with their mouths what was not in their hearts. And Allah has full knowledge of what they conceal.

(27) They ask your legal instruction concerning women, say: Allah instructs you about them, and about what is recited unto you in the Book concerning the orphan girls whom you give not the prescribed portions (as regards Mahr and inheritance) and yet whom you desire to marry, and (concerning) the children who are weak and oppressed, and that you stand firm for justice to orphans. And whatever good you do, Allah is Ever All-Aware of it.

(28) Whether you (mankind) disclose (by good words of thanks) a good deed (done to you in the form of a favour by someone), or conceal it, or pardon an evil, ... verily, Allah is Ever Oft-Pardoning, All-Powerful.

(29) Verily, those who disbelieve [by concealing the truth about Prophet Muhammad صلى الله عليه وسلم and his message of true Islamic Monotheism written in the Taurat (Torah) and the Injeel (Gospel) with them] and prevent (mankind) from the Path of Allah (Islamic Monotheism); they have certainly strayed far away. (Tafsir Al-Qurtubi).

(30) Verily, those who disbelieve and did wrong [by concealing the truth about Prophet Muhammad صلى الله عليه وسلم and his message of true Islamic Monotheism written in the Taurat (Torah) and the Injeel (Gospel) with them]; Allah will not forgive them, nor will He guide them to any way - (Tafsir Al-Qurtubi).