They multiplied, through God's overruling providence and singular blessing, which God gave them purposely to hasten first their sorer affliction, and next, and by that means, their glorious deliverance. They were grieved, through envy and fear.
Related Commentaries of Exodus 1:12
Exodus 1:12
12 But the more they afflicted them, the more they multiplied and grew. And they were grieved because of the children of Israel.