For Yahweh your God dried up the waters of the Jordan from before you, until you were passed over, as Yahweh your God did to the Red Sea, which he dried up from before us, until we were passed over;
It is a good custom to memorialize God’s great acts for us so that we will remember them and so that our children will learn that God is powerful and faithful. Baptism is one such memorial for the Christian, and the Lord’s Supper is another.