Deuteronomy 23:6

Thou shalt not seek their peace and their good all thy days to forever.

Ezra 9:12

And now ye shall not give your daughters to their sons, and ye shall not take their daughters to your sons, and ye shall not seek their peace and their good even forever, so that ye shall be strong and eat the good of the land, and cause to your sons to inherit even forever.

2 Samuel 8:2

And he will smite Moab, and measure them with a cord, laying them down upon the earth; and he will measure with two cords to put to death, and a full cord to save alive. And Moab will be to David for servants, lifting up gifts.

2 Samuel 12:31

And the people which were in it he brought forth, and he will put at the saw and at the threshing-sledge of iron, and at axes of iron, and caused them to pass over through the brick-kiln: and thus he will do to all the cities of the sons of Ammon. And David will turn back, and all the people, to Jerusalem.

Nehemiah 13:23-25

Also in those days I saw Jews who caused to dwell women, Ashdodites, Ammonites, Moabites:

Treasury of Scripture Knowledge

Summary

Thou shalt not seek their peace nor their prosperity all thy days for ever.

Bible References

Thou shalt

2 Samuel 8:2
And he will smite Moab, and measure them with a cord, laying them down upon the earth; and he will measure with two cords to put to death, and a full cord to save alive. And Moab will be to David for servants, lifting up gifts.
2 Samuel 12:31
And the people which were in it he brought forth, and he will put at the saw and at the threshing-sledge of iron, and at axes of iron, and caused them to pass over through the brick-kiln: and thus he will do to all the cities of the sons of Ammon. And David will turn back, and all the people, to Jerusalem.
Ezra 9:12
And now ye shall not give your daughters to their sons, and ye shall not take their daughters to your sons, and ye shall not seek their peace and their good even forever, so that ye shall be strong and eat the good of the land, and cause to your sons to inherit even forever.
Nehemiah 13:23
Also in those days I saw Jews who caused to dwell women, Ashdodites, Ammonites, Moabites: