Numbers 1:38

Overview - Numbers 1
1	God commands Moses to number the people.
5	The princes of the tribes.
17	The number of every tribe.
47	The Levites are exempted for the service of the Lord.

Numbers 1:38  (King James Version)
Of the children of Dan, by their generations, after their families, by the house of their fathers, according to the number of the names, from twenty years old and upward, all that were able to go forth to war;