Rabbi Yisroel ben Avrohom Wrote:It demonstrates that before that episode the Tribes did intermarry.
I don't read anywhere where it demonstrates what you claim and to give you the benefit of the doubt, nor does it demonstrate that Moses said it was OK.
Judges 21:24
At that time the Israelites left that place and went home to their tribes and clans, each to his own inheritance.
This above shows that they still kept their inheritance tribal.
Let's read verbatim, not opinion:
Numbers 36:7
So shall not the inheritance of the children of Israel remove from tribe to tribe: for every one of the children of Israel shall keep himself to the inheritance of the tribe of his fathers.
Joshua 11:23
So Joshua took the whole land,
according to all that the LORD said to Moses; and Joshua gave it for an inheritance to Israel according to their divisions by their tribes. And the land rested from war.
Ezekiel 48:29
This is the land which you shall divide
by lot to the tribes of Israel for inheritance, and these are their portions, says the Lord GOD.