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

(141) Or say they: He hath invented a lie concerning Allah? If Allah willed, He could have sealed thy heart (against them). And Allah will wipe out the lie and will vindicate the truth by His words. Lo! He is Aware of what is hidden in the breasts (of men).

(142) And that those who argue concerning Our revelations may know they have no refuge.

(143) And lo! verily there is knowledge of the Hour. So doubt ye not concerning it, but follow Me. This is the right path.

(144) When Jesus came with clear proofs (of Allah's Sovereignty), he said: I have come unto you with wisdom, and to make plain some of that concerning which ye differ. So keep your duty to Allah, and obey me.

(145) And gave them plain commandments. And they differed not until after the knowledge came unto them, through rivalry among themselves. Lo! thy Lord will judge between them on the Day of Resurrection concerning that wherein they used to differ.

(146) Or say they: He hath invented it? Say (O Muhammad): If I have invented it, still ye have no power to support me against Allah. He is Best Aware of what ye say among yourselves concerning it. He sufficeth for a witness between me and you. And He is the Forgiving, the Merciful.

(147) Such are those on whom the Word concerning nations of the jinn and mankind which have passed away before them hath effect. Lo! they are the losers.

(148) And may punish the hypocritical men and the hypocritical women, and the idolatrous men and the idolatrous women, who think an evil thought concerning Allah. For them is the evil turn of fortune, and Allah is wroth against them and hath cursed them, and hath made ready for them hell, a hapless journey's end.

(149) Lo! ye, forsooth, are of various opinion (concerning the truth).

(150) Then he conceived a fear of them. They said: Fear not! and gave him tidings of (the birth of) a wise son.