Numbers 36:6 VOICE

[6] In light of it, He has determined that Zelophehad's daughters should marry whomever they think is best, but they should do so within the clan of their extended family so that their land stays in the family. The same goes for any future Israelite daughters in a similar situation. Let them marry whomever they will, but only within the clan of their father's extended family. There shouldn't be any permanent transfer of land from one tribe to another because the territories should be fixed as each tribe's inheritance for all time.