What did Satan understand about the Abrahamic covenant when it was given to Abraham?
When the Abrahamic covenant was given, Satan understood it was the vehicle God would use to bring about the seed of the woman. Therefore he turned on Israel, attacking and seeking to destroy the nation, because destroying Israel would cause God's whole program to fall apart.
Les explains that when the Abrahamic covenant was given to Abraham, Satan understood this was now the vehicle God was going to use to bring about the seed of the woman. So Satan turns on the nation of Israel. All the way up through Israel's history there is that satanic attack and apparent desire to destroy the nation of Israel, because if Satan could destroy Israel, then God's whole program would fall apart. Les also notes the same pattern as you come into the advent of Christianity: Satan is going to do everything in his power to disrupt it, to destroy it, in order to thwart the very program of God.