Shared ground
Numbers 36:5–7 presents Moses as delivering a binding decision “according to the word of Yahweh.” The text is explicit that Moses agrees with the concern raised by the tribe connected to Joseph: their claim is “right.” The immediate issue is practical: land inherited within a tribe could end up controlled by another tribe through marriage.
The passage also holds two things together: real personal choice (“whomever they think best”) and a clear boundary (marriage must stay “within the family of the tribe of their father”). The stated purpose is not romantic or moral commentary on marriage itself, but protecting Israel’s land allotments from shifting between tribes.
Where interpretation differs
One main question is how broad the restriction is. Some read Moses’ words as a special, one-case ruling limited to Zelophehad’s daughters (and situations like theirs), because the instruction is framed as “concerning the daughters of Zelophehad.” Others think it reflects (or becomes) a wider rule for heiress-inheritance cases, since the purpose statement in v. 7 is phrased in general terms about “the children of Israel” and inheritance moving “from tribe to tribe.”
A second question is what “family of the tribe of their father” means in practice. Some take it narrowly (marry within a closer clan group inside the tribe). Others take it more broadly (anyone within the same tribe), because the stated goal is simply to stop land transfer across tribal lines.
Why the disagreement exists
The wording points in two directions at once: v. 6 names a specific family (Zelophehad’s daughters), while v. 7 gives a general rationale about preserving tribal allotments for all Israel. Also, the key term “tribe” () can be used alongside smaller kinship groupings, which leaves room for different judgments about how tight “family” is meant to be.
What this passage clearly contributes
The text clearly contributes (1) the idea that Israel’s land allotments are treated as a protected trust tied to ancestral identity, (2) that community stability can shape marriage rules in the land-allotment context, and (3) that the law here aims at preventing inheritance from shifting between tribes. It also shows Moses functioning as the public messenger of Yahweh’s direction in resolving a new conflict that arises from an earlier justice decision (the daughters’ right to inherit in Numbers 27).