3 Now if they get married to any of the sons of other tribes of the children of Israel, then their property will be taken away from the heritage of our fathers, and become part of the heritage of the tribe into which they get married: and their heritage will be taken away from the heritage of our tribe.
Matthew Henry's Commentary on Numbers 36:3
Commentary on Numbers 36:1-4
(Read Numbers 36:1-4)
The heads of the tribe of Manasseh represent the evil which might follow, if the daughters of Zelophehad should marry into any other tribes. They sought to preserve the Divine appointment of inheritances, and that contests and quarrels should not rise among those who should come afterwards. It is the wisdom and duty of those who have estates in the world, to settle them, and to dispose of them, so that no strife and contention may arise.