The word(s) "once" appears 177 time(s) in 167 verse(s) in Quran in Muhammad Pickthal translation.

(51) Thus is the Word of thy Lord justified concerning those who do wrong: that they believe not.

(52) Say: Have ye considered what provision Allah hath sent down for you, how ye have made of it lawful and unlawful? Hath Allah permitted you, or do ye invent a lie concerning Allah?

(53) And what think those who invent a lie concerning Allah (will be their plight) upon the Day of Resurrection? Lo! Allah truly is Bountiful toward mankind, but most of them give not thanks.

(54) They say: Allah hath taken (unto Him) a son - Glorified be He! He hath no needs! His is all that is in the heavens and all that is in the earth. Ye have no warrant for this. Tell ye concerning Allah that which ye know not?

(55) Say: Verily those who invent a lie concerning Allah will not succeed.

(56) But if ye are averse I have asked of you no wage. My wage is the concern of Allah only, and I am commanded to be of those who surrender (unto Him).

(57) And We verily did allot unto the Children of Israel a fixed abode, and did provide them with good things; and they differed not until the knowledge came unto them. Lo! thy Lord will judge between them on the Day of Resurrection concerning that wherein they used to differ.

(58) And if thou (Muhammad) art in doubt concerning that which We reveal unto thee, then question those who read the Scripture (that was) before thee. Verily the Truth from thy Lord hath come unto thee. So be not thou of the waverers.

(59) Lo! those for whom the word of thy Lord (concerning sinners) hath effect will not believe,

(60) Is he (to be counted equal with them) who relieth on a clear proof from his Lord, and a witness from Him reciteth it, and before it was the Book of Moses, an example and a mercy? Such believe therein, and whoso disbelieveth therein of the clans, the Fire is his appointed place. So be not thou in doubt concerning it. Lo! it is the Truth from thy Lord; but most of mankind believe not.