Egypt had been a cruel master, but the Lord would submit the nation to a cruel master of its own,

“‘And the Egyptians I will give into the hand of a cruel master, and a fierce king will rule over them,’ says the Lord, the LORD of hosts” (Isaiah 19:4).

As nations do to others, so shall it be done them to those nations.

Therefore, to prevent your nation from suffering at the hand of a cruel master, be sure that you are rich in good works.