Exodus 14:21-23

21Then Moses stretched out his hand over the sea. Adonai drove the sea back with a strong east wind throughout the night and turned the sea into dry land. So the waters were divided.

22Then Bnei-Yisrael went into the midst of the sea on the dry ground, while the waters were like walls to them on their right and on their left.

23But the Egyptians pursued and went in after them into the midst of the sea, all Pharaoh’s horses, his chariots and his horsemen.