C. F. Keil and Franz Delitzsch on Deuteronomy 23:10-11

Deu 23:10-11

The person who had become unclean through a nightly occurrence, was to go out of the camp and remain there till he had cleansed himself in the evening. On the journey through the desert, none but those who were affected with uncleanness of a longer duration were to be removed from the camp (Num 5:2) but when they were encamped, this law was to apply to even lighter defilements.