What does the line 'the horse and his rider he has thrown into the sea' refer to?
The line refers to the Egyptians drowned in the Red Sea, with their horses and riders thrown into the sea. The Israelites were looking back at the Egyptians floating on the seashore after being drowned by the Red Sea, celebrating God's triumphant deliverance.
Les teaches that this line is part of Israel's song of deliverance and redemption after the Red Sea experience. The Israelites were looking back at the Egyptians floating on the seashore, having been drowned by the Red Sea. The horse and rider thrown into the sea are the Egyptian horses and riders. This song of Moses celebrates the Lord's glorious triumph and continues with praise that the Lord is strength, song, salvation, and a man of war.
Then sang Moses and the children of Israel this song unto the LORD, and spake, saying, I will sing unto the LORD, for he hath triumphed gloriously: the horse and his rider hath he thrown into the sea.