Adam Clarke on Numbers 36:2

To give the inheritance of Zelophehad - unto his daughters - See this case spoken of at large on Numbers 27 (note).

Either the first eleven verses of Numbers 27 should come in before this chapter, or this chapter should come in immediately after those eleven verses; they certainly both make parts of the same subject.

Here Moses determines that heiresses should marry in their own tribe, that no part of the ancient inheritance might be alienated from the original family.