Joshua 13:15 Kabbalah

וַיִּתֵּ֣ן מֹשֶׁ֔ה לְמַטֵּ֥ה בְנֵֽי־רְאוּבֵ֖ן לְמִשְׁפְּחֹתָֽם׃

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

Read kabbalistic (mystical) interpretation of Joshua 13:15: and classical mystical sources.