Exodus 1:7

1:7 The Israelites, however, were fruitful, increased greatly, multiplied, and became extremely strong, so that the land was filled with them.

Exodus 7:12-13

7:12 Each man threw down his staff, and the staffs became snakes. But Aaron’s staff swallowed up their staffs. 7:13 Yet Pharaoh’s heart became hard, and he did not listen to them, just as the Lord had predicted.