Reference for Joshua 13:15

וַיִּתֵּ֣ן מֹשֶׁ֔ה לְמַטֵּ֥ה בְנֵֽי־רְאוּבֵ֖ן לְמִשְׁפְּחֹתָֽם׃

And Moses gave unto the tribe of the children of Reuben according to their families.

BDB