# You must never seek their peace or prosperity

Possible meanings are 1) "You should never make a peace treaty with the Ammonites and the Moabites" or 2) "You must not do anything to cause things to go well for those 2 people groups to enable them to prosper" .

# during all your days

This is an idiom. Alternate translation: "as long as you are a nation" (See: [[rc://en/ta/man/translate/figs-idiom]])