Exodus 10:19 WEB

¹⁷  Now therefore please forgive my sin again, and pray to Yahweh your God, that he may also take away from me this death.'

¹⁸  He went out from Pharaoh, and prayed to Yahweh.

¹⁹  Yahweh turned an exceeding strong west wind, which took up the locusts, and drove them into the Red Sea. There remained not one locust in all the borders of Egypt.

²⁰  But Yahweh hardened Pharaoh's heart, and he didn't let the children of Israel go.

²¹  Yahweh said to Moses, 'Stretch out your hand toward the sky, that there may be darkness over the land of Egypt, even darkness which may be felt.'