Deuteronomy 23:6

Do nothing for their peace or well-being for ever.

Ezra 9:12

So now do not give your daughters to their sons or take their daughters for your sons or do anything for their peace or well-being for ever; so that you may be strong, living on the good of the land, and handing it on to your children for a heritage for ever.

2 Samuel 8:2

And he overcame the Moabites, and he had them measured with a line when they were stretched out on the earth; marking out two lines for death and one full line for life. So the Moabites became servants to David and gave him offerings.

2 Samuel 12:31

And he took the people out of the town and put them to work with wood-cutting instruments, and iron grain-crushers, and iron axes, and at brick-making: this he did to all the towns of the children of Ammon. Then David and all the people went back to Jerusalem.

Nehemiah 13:23-25

And in those days I saw the Jews who were married to women of Ashdod and Ammon and Moab:

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 overcame the Moabites, and he had them measured with a line when they were stretched out on the earth; marking out two lines for death and one full line for life. So the Moabites became servants to David and gave him offerings.
2 Samuel 12:31
And he took the people out of the town and put them to work with wood-cutting instruments, and iron grain-crushers, and iron axes, and at brick-making: this he did to all the towns of the children of Ammon. Then David and all the people went back to Jerusalem.
Ezra 9:12
So now do not give your daughters to their sons or take their daughters for your sons or do anything for their peace or well-being for ever; so that you may be strong, living on the good of the land, and handing it on to your children for a heritage for ever.
Nehemiah 13:23
And in those days I saw the Jews who were married to women of Ashdod and Ammon and Moab:

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain