Ulangan 23:10

23:10 If there is someone among you who is impure because of some nocturnal emission, ¹  he must leave the camp; he may not reenter it immediately.

Ulangan 29:25

29:25 Then people will say, “Because they abandoned the covenant of the Lord, the God of their ancestors, which he made with them when he brought them out of the land of Egypt.

[23:10]  ¹ tn Heb “nocturnal happening.” The Hebrew term קָרֶה (qareh) merely means “to happen” so the phrase here is euphemistic (a “night happening”) for some kind of bodily emission such as excrement or semen. Such otherwise normal physical functions rendered one ritually unclean whether accidental or not. See Lev 15:16-18; 22:4.