The word(s) "oath" appears 29 time(s) in 25 verse(s) in Quran in Muhammad Pickthal translation.

(11) Fulfil the covenant of Allah when ye have covenanted, and break not your oaths after the asseveration of them, and after ye have made Allah surety over you. Lo! Allah knoweth what ye do.

(12) And be not like unto her who unravelleth the thread, after she hath made it strong, to thin filaments, making your oaths a deceit between you because of a nation being more numerous than (another) nation. Allah only trieth you thereby, and He verily will explain to you on the Day of Resurrection that wherein ye differed.

(13) Make not your oaths a deceit between you, lest a foot should slip after being firmly planted and ye should taste evil forasmuch as ye debarred (men) from the way of Allah, and yours should be an awful doom.

(14) And verily they had already sworn unto Allah that they would not turn their backs (to the foe). An oath to Allah must be answered for.

(15) And they swore by Allah, their most binding oath, that if a warner came unto them they would be more tractable than any of the nations; yet, when a warner came unto them it aroused in them naught save repugnance,

(16) And (it was said unto him): Take in thine hand a branch and smite therewith, and break not thine oath. Lo! We found him steadfast, how excellent a slave! Lo! he was ever turning in repentance (to his Lord).

(17) Lo! those who swear allegiance unto thee (Muhammad), swear allegiance only unto Allah. The Hand of Allah is above their hands. So whosoever breaketh his oath, breaketh it only to his soul's hurt; while whosoever keepeth his covenant with Allah, on him will He bestow immense reward.

(18) And lo! that verily is a tremendous oath, if ye but knew -

(19) Hast thou not seen those who take for friends a folk with whom Allah is wroth? They are neither of you nor of them, and they swear a false oath knowingly.

(20) They make a shelter of their oaths and turn (men) from the way of Allah; so theirs will be a shameful doom.