Crossing the Red Sea
"Moses stretched out his hand over the sea. The Lord drove back the sea with a strong easterly wind all night, and he made dry land of the sea. The waters parted and the sons of Israel went on dry ground right into the sea, walls of water to right and to left of them" - Exodus 14:21, which is part of today's First Reading at Mass.
This stained glass detail is from Henley parish church.