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

(131) Thus was the word of thy Lord concerning those who disbelieve fulfilled: That they are owners of the Fire.

(132) And verily Joseph brought you of old clear proofs, yet ye ceased not to be in doubt concerning what he brought you till, when he died, ye said: Allah will not send any messenger after him. Thus Allah deceiveth him who is a prodigal, a doubter.

(133) Those who wrangle concerning the revelations of Allah without any warrant that hath come unto them, it is greatly hateful in the sight of Allah and in the sight of those who believe. Thus doth Allah print on every arrogant, disdainful heart.

(134) Lo! those who wrangle concerning the revelations of Allah without a warrant having come unto them, there is naught else in their breasts save pride which they will never attain. So take thou refuge in Allah. Lo! He, only He, is the Hearer, the Seer.

(135) Hast thou not seen those who wrangle concerning the revelations of Allah, how they are turned away? -

(136) And We assigned them comrades (in the world), who made their present and their past fairseeming unto them. And the Word concerning nations of the jinn and humankind who passed away before them hath effect for them. Lo! they were ever losers.

(137) And We verily gave Moses the Scripture, but there hath been dispute concerning it; and but for a Word that had already gone forth from thy Lord, it would ere now have been judged between them; but lo! they are in hopeless doubt concerning it.

(138) And they were not divided until after the knowledge came unto them, through rivalry among themselves; and had it not been for a Word that had already gone forth from thy Lord for an appointed term, it surely had been judged between them. And those who were made to inherit the Scripture after them are verily in hopeless doubt concerning it.

(139) And those who argue concerning Allah after He hath been acknowledged, their argument hath no weight with their Lord, and wrath is upon them and theirs will be an awful doom.

(140) Those who believe not therein seek to hasten it, while those who believe are fearful of it and know that it is the Truth. Are not they who dispute, in doubt concerning the Hour, far astray?