9:12a Now, therefore, do not give your daughters in marriage to their sons or take their daughters for your sons.

Now therefore, do (plur.) not allow any of your daughters to marry their sons or take their daughters as wives for your sons.
-or-
So, do not allow marriages between your daughters and their sons or your sons and their daughters.
-or-
That is why you told us not to let our (excl.) young women marry those foreign men and not to let the men of Israel marry the young women of the land.

9:12b Never seek their peace or prosperity,

Do (plur.) not ever help them prosper or succeed.
-or-
Never do anything that will cause/bring them well-being or prosperity.
-or-
You said that from now to the end of time we (excl.) should not even let them live in happiness or help them in any way.

9:12c so that you may be strong and may eat the good things of the land,

Do these things so that you (plur.) will be a strong people/nation, you (plur.) will enjoy eating the good food grown on the land,
-or-
If you obey these instructions, you will establish yourselves firmly in the land. You will enjoy the good things the land produces
-or-
Only by doing that we would be strong as a nation. The land would produce good crops that we would eat to our joy/happiness.

9:12d leaving it as an inheritance to your sons forever.’

and you (plur.) and your children will live in this land forever.’
-or-
and pass the land on to your children as their inheritance into the future.
-or-
And it would belong to our descendants from that time and/until forever.

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