Numbers Chapter 1, Verse 3
From BibleWiki
3: From twenty years old and upward, all that are able to go
forth to war in Israel: thou and Aaron shall number them by
their armies.
3: From twenty years old and upwards, of all the men of Israel fit for
war, and you shall number them by their troops, thou and Aaron.
3: from twenty years old and upwards, every one that goes forth in the forces of Israel, take account of them with their strength; thou and Aaron take account of them.
Numbers Chapter 1, Verse 3/commentary

