וְלֹֽא־תִסֹּ֧ב נַחֲלָ֛ה מִמַּטֶּ֖ה לְמַטֶּ֣ה אַחֵ֑ר כִּי־אִישׁ֙ בְּנַ֣חֲלָת֔וֹ יִדְבְּק֕וּ מַטּ֖וֹת בְּנֵ֥י יִשְׂרָאֵֽל׃
So shall no inheritance remove from one tribe to another tribe; for the tribes of the children of Israel shall cleave each one to its own inheritance.’
Read kabbalistic (mystical) interpretation of Numbers 36:9: and classical mystical sources.