3 Now suppose they marry men from other Israelite tribes; then their inheritance will be taken from our ancestral inheritance and added to that of the tribe they marry into. And so part of the inheritance allotted to us will be taken away.

Read Numbers 36:3 Using Other Translations

And if they be married to any of the sons of the other tribes of the children of Israel, then shall their inheritance be taken from the inheritance of our fathers, and shall be put to the inheritance of the tribe whereunto they are received: so shall it be taken from the lot of our inheritance.
But if they are married to any of the sons of the other tribes of the people of Israel, then their inheritance will be taken from the inheritance of our fathers and added to the inheritance of the tribe into which they marry. So it will be taken away from the lot of our inheritance.
But if they marry men from another tribe, their grants of land will go with them to the tribe into which they marry. In this way, the total area of our tribal land will be reduced.