The word(s) "oath" appears 38 time(s) in 32 verse(s) in Quran in Abdullah Yusuf Ali translation.

(21) They swear their strongest oaths by Allah that, if only thou wouldst command them, they would leave (their homes). Say: "Swear ye not; Obedience is (more) reasonable; verily, Allah is well acquainted with all that ye do."

(22) They said: "Swear a mutual oath by Allah that we shall make a secret night attack on him and his people, and that we shall then say to his heir (when he seeks vengeance): 'We were not present at the slaughter of his people, and we are positively telling the truth.'"

(23) in this world We made a curse to follow them and on the Day of Judgment they will be among the loathed (and despised).

(24) They swore their strongest oaths by Allah that if a warner came to them, they would follow his guidance better than any (other) of the Peoples: But when a warner came to them, it has only increased their flight (from righteousness),-

(25) "And take in thy hand a little grass, and strike therewith: and break not (thy oath)." Truly We found him full of patience and constancy. How excellent in Our service! ever did he turn (to Us)!

(26) Verily those who plight their fealty to thee do no less than plight their fealty to Allah: the Hand of Allah is over their hands: then any one who violates his oath, does so to the harm of his own soul, and any one who fulfils what he has covenanted with Allah,- Allah will soon grant him a great Reward.

(27) They have made their oaths a screen (for their misdeeds): thus they obstruct (men) from the Path of Allah: therefore shall they have a humiliating Penalty.

(28) O Prophet! When believing women come to thee to take the oath of fealty to thee, that they will not associate in worship any other thing whatever with Allah, that they will not steal, that they will not commit adultery (or fornication), that they will not kill their children, that they will not utter slander, intentionally forging falsehood, and that they will not disobey thee in any just matter,- then do thou receive their fealty, and pray to Allah for the forgiveness (of their sins): for Allah is Oft-Forgiving, Most Merciful.

(29) They have made their oaths a screen (for their misdeeds): thus they obstruct (men) from the Path of Allah: truly evil are their deeds.

(30) Allah has already ordained for you, (O men), the dissolution of your oaths (in some cases): and Allah is your Protector, and He is Full of Knowledge and Wisdom.