Numbers 5:20

Modern King James Version

But if you have gone aside, being under your husband, and if you are defiled and some man besides your husband has given his semen to you,

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Speak to the sons of Israel and say to them, If any man's wife goes astray, and has committed a trespass against him,

And if any man's semen goes from him, then he shall wash all his flesh in water and be unclean until the evening.