Exodus 10:1-5

1And the LORD said to Moses, Go in to Pharaoh: for I have hardened his heart, and the heart of his servants, that I might show these my signs before him:

2And that thou mayest tell in the ears of thy son, and of thy son’s son, what things I have wrought in Egypt, and my signs which I have done among them; that ye may know how that I am the LORD.

3And Moses and Aaron came in to Pharaoh, and said to him, Thus saith the LORD God of the Hebrews, How long wilt thou refuse to humble thyself before me? let my people go, that they may serve me.

4Else, if thou shalt refuse to let my people go, behold, to morrow will I bring the locusts into thy land:

5And they shall cover the face of the earth, that one cannot be able to see the earth: and they shall eat the rest of that which hath escaped, which remaineth to you from the hail, and shall eat every tree which groweth for you out of the field:1