Deu 23:3 “No Ammonite or Moabite may enter the assembly of the LORD. Even to the tenth generation, none of them may enter the assembly of the LORD forever,
Deu 23:4 because they did not meet you with bread and with water on the way, when you came out of Egypt, and because they hired against you Balaam the son of Beor from Pethor of Mesopotamia, to curse you.
Deu 23:5 But the LORD your God would not listen to Balaam; instead the LORD your God turned the curse into a blessing for you, because the LORD your God loved you.

In Numbers 22:6 we learn that Balak sends for Balaam to come and curse Israel because “they are too mighty.” But Israel is “too mighty” in several senses:

1) Israel is “too mighty” because they are too numerous (causing fear in Moabites, Numbers 22:3)
2) Israel is “too mighty” because they are the descendants of Abraham, the descendants of promise (“shall surely become a great and mighty nation,” Genesis 18:18)
3) Israel is “too mighty” because the Lord does not listen to the wicked (the enemies of the descendants of Abraham/promise)
4) Israel is “too mighty” because they serve the Lord (whose lordship extends over blessings and curses); the Lord, who for the descendants of Abraham/promise, turns the curses of their enemies into blessings