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

(41) O Children of Adam! We have revealed unto you raiment to conceal your shame, and splendid vesture, but the raiment of restraint from evil, that is best. This is of the revelations of Allah, that they may remember.

(42) And when they do some lewdness they say: We found our fathers doing it and Allah hath enjoined it on us. Say: Allah, verily, enjoineth not lewdness. Tell ye concerning Allah that which ye know not?

(43) Say: My Lord forbiddeth only indecencies, such of them as are apparent and such as are within, and sin and wrongful oppression, and that ye associate with Allah that for which no warrant hath been revealed, and that ye tell concerning Allah that which ye know not.

(44) Who doeth greater wrong than he who inventeth a lie concerning Allah or denieth Our tokens. (For such) their appointed portion of the Book (of destiny) reacheth them till, when Our messengers come to gather them, they say: Where (now) is that to which ye cried beside Allah? They say: They have departed from us. And they testify against themselves that they were disbelievers.

(45) Approved upon condition that I speak concerning Allah nothing but the truth. I come unto you (lords of Egypt) with a clear proof from your Lord. So let the Children of Israel go with me.

(46) And a generation hath succeeded them who inherited the scriptures. They grasp the goods of this low life (as the price of evil-doing) and say: It will be forgiven us. And if there came to them (again) the offer of the like, they would accept it (and would sin again). Hath not the covenant of the Scripture been taken on their behalf that they should not speak aught concerning Allah save the truth? And they have studied that which is therein. And the abode of the Hereafter is better, for those who ward off (evil). Have ye then no sense?

(47) The hypocrites fear lest a surah should be revealed concerning them, proclaiming what is in their hearts. Say: Scoff (your fill)! Lo! Allah is disclosing what ye fear.

(48) See they not that they are tested once or twice in every year? Still they turn not in repentance, neither pay they heed.

(49) There hath come unto you a messenger, (one) of yourselves, unto whom aught that ye are overburdened is grievous, full of concern for you, for the believers full of pity, merciful.

(50) Who doeth greater wrong than he who inventeth a lie concerning Allah and denieth His revelations? Lo! the guilty never are successful.