'Affair' in the Bible

Then the priest will make her swear an oath, and he will say to the woman, "If a man has not slept with you, and if you have not had an impurity affair under your husband, go unpunished from the waters of bitterness that brings this curse.

But if you have had an affair under your husband, and if you are defiled and a man other than your husband had intercourse with you,"

" 'This [is] the regulation of jealousy, when a woman has an affair under her husband and she is defiled,

for they have been hostile to you with their tricks, with which they have deceived you in the affair of Peor and in the affair of Cozbi, the daughter of the leader of Midian, their sister who was slain on the day of the plague because of Peor.”