1)
Why would they think not to marry women?
1.
Malbim: Do not think that you or your children will return to Eretz Yisrael, and marry women there.
2)
Why does it add that they should give their daughters to men?
1.
Malbim: Do not send them to Eretz Yisrael to marry men there, for Bnei Eretz Yisrael will be killed.
