'On that Day' in the Bible

But on that day I will mark off the land of Goshen, where my people are staying, so that no swarms of flies will be there, that you may know that I am the Lord in the midst of this land.

You are to tell your son on that day, 'It is because of what the Lord did for me when I came out of Egypt.'

So the Lord saved Israel on that day from the power of the Egyptians, and Israel saw the Egyptians dead on the shore of the sea.