These are the lines from the Song of Miriam, and Miriam sang her song at the seashore at early hours of the day break before the Sun God rises in the sea.
It is a traditional belief that the Sun rises from the sea in his chariot drawn by ‘seven horses’. As Miriam was suffering from leprosy she has arrived at the ‘promised land’, the Canaan, with Moses, to pray for the Sun in order to get cured from this dreaded disease of the ancient world. ‘Canaan, the promised Land’ is Kanvaya of Indian puranas, and it is the same as Maitrya forest, which, as the name suggests, is the worshipping place of the Sun God.
Naming of the song as Song of the Sea is wrong; it is a song meant for the God Sun; it is not a victory hymn. It does not praise God Yahweh for throwing the military forces of Pharaoh into the sea, who as biblical scholars think, were pursuing then the fleeing Israelites.
Exodus is mostly a misunderstood document whose contents do not describe the escape of the Israelites from Egypt to Canaan but it is meant for something as we read from the Song of Miriam.