The word(s) "once" appears 119 time(s) in 116 verse(s) in Quran in Abdullah Yusuf Ali translation.

(101) (When they did not eat), He conceived a fear of them. They said, "Fear not," and they gave him glad tidings of a son endowed with knowledge.

(102) Hasten ye then (at once) to Allah: I am from Him a Warner to you, clear and open!

(103) Will ye then dispute with him concerning what he saw?

(104) Then will no (soul) entertain falsehood concerning its coming.

(105) Allah has indeed heard (and accepted) the statement of the woman who pleads with thee concerning her husband and carries her complaint (in prayer) to Allah: and Allah (always) hears the arguments between both sides among you: for Allah hears and sees (all things).

(106) O ye who believe! Take not my enemies and yours as friends (or protectors),- offering them (your) love, even though they have rejected the Truth that has come to you, and have (on the contrary) driven out the Prophet and yourselves (from your homes), (simply) because ye believe in Allah your Lord! If ye have come out to strive in My Way and to seek My Good Pleasure, (take them not as friends), holding secret converse of love (and friendship) with them: for I know full well all that ye conceal and all that ye reveal. And any of you that does this has strayed from the Straight Path.

(107) He knows what is in the heavens and on earth; and He knows what ye conceal and what ye reveal: yea, Allah knows well the (secrets) of (all) hearts.

(108) We have sent to you, (O men!) a messenger, to be a witness concerning you, even as We sent a messenger to Pharaoh.

(109) Move not thy tongue concerning the (Qur'an) to make haste therewith.

(110) Then did he stalk to his family in full conceit!