Parallel
Numbers 31:19
Brenton's English Septuagint · Berean Standard Bible
And ye shall encamp outside the [great] camp seven days; every one who has slain and who touches a dead body, shall be purified on the third day, and ye and your captivity [shall purify yourselves] on the seventh day.
All of you who have killed a person or touched the dead are to remain outside the camp for seven days. On the third day and the seventh day you are to purify both yourselves and your captives.