CHAPTER 15 Feb.7 
Moses’ Song of Praise
Then Moses and the children of Israel sang this song to Yahweh, and said, I will sing to Yahweh, for He has triumphed gloriously. The horse and his rider He has thrown into the sea. 2Yah is my strength and song. He has become my salvation. This is my God, and I will praise Him; my father’s God, and I will exalt Him. 3Yahweh is a man of war. Yahweh is His name. 4He has cast Pharaoh’s chariots and his army into the sea. His chosen captains are sunk in the Red Sea. 5The deeps cover them. They went down into the depths like a stone. 6Your right hand, Yahweh, is glorious in power. Your right hand, Yahweh, dashes the enemy in pieces. 7In the greatness of Your excellency, You overthrow those who rise up against You. You send forth Your wrath. It consumes them as stubble. 8With the blast of Your nostrils, the waters were piled up. The floods stood upright as a heap. The deeps were congealed in the heart of the sea. 9The enemy said, ‘I will pursue. I will overtake. I will divide the spoil. My desire shall be satisfied on them. I will draw my sword, my hand shall destroy them’. 10You blew with Your wind. The sea covered them. They sank like lead in the mighty waters. 11Who is like You, Yahweh, among the gods? Who is like You, glorious in holiness, fearful in praises, doing wonders? 12You stretched out Your right hand. The earth swallowed them. 13You, in Your grace, have led the people that You have redeemed. You have guided them in Your strength to Your holy habitation. 14The peoples have heard. They tremble. Pangs have taken hold on the inhabitants of Philistia. 15Then the chiefs of Edom were dismayed. Trembling takes hold of the mighty men of Moab. All the inhabitants of Canaan are melted away. 16Terror and dread falls on them. By the greatness of your arm they are as still as a stone—until Your people pass over, Yahweh, until the people pass over whom You have purchased. 17You shall bring them in, and plant them in the mountain of your inheritance, the place, Yahweh, which You have made for yourself to dwell in; the sanctuary, Lord, which Your hands have established. 18Yahweh shall reign forever and ever. 19For the horses of Pharaoh went in with his chariots and with his horsemen into the sea, and Yahweh brought back the waters of the sea on them; but the children of Israel walked on dry land in the midst of the sea. 20Miriam the prophetess, the sister of Aaron, took a tambourine in her hand; and all the women went out after her with tambourines and with dances. 21Miriam answered them, Sing to Yahweh, for He has triumphed gloriously. The horse and his rider He has thrown into the sea.
Bitter Waters at Marah
22Moses led Israel onward from the Red Sea, and they went out into the wilderness of Shur; and they went three days in the wilderness, and found no water. 23When they came to Marah, they couldn’t drink from the waters of Marah, for they were bitter. Therefore its name was called Marah. 24The people murmured against Moses, saying, What shall we drink? 25Then he cried to Yahweh. Yahweh showed him a tree, and he threw it into the waters, and the waters were made sweet. There He made a statute and an ordinance for them, and there He tested them; 26and He said, If you will diligently listen to the voice of Yahweh your God, and will do that which is right in His eyes, and will pay attention to His commandments, and keep all His statutes, I will put none of the diseases on you, which I have put on the Egyptians; for I am Yahweh who heals you. 27They came to Elim, where there were twelve springs of water, and seventy palm trees: and they encamped there by the waters.

Commentary

15:1 The faithful believers will sing the Song of Moses when they enter God’s Kingdom and all our troubled waters are permanently calm (Rev. 15:3). The Israelites are set up as our examples, and we should learn the lessons from their subsequent failures.
15:2 My father's God- Moses was only with his parents in babyhood and maybe very early childhood. They inculcated in him the faith of Yahweh at that early age. They likely died whilst he was still in the court of Pharaoh and looked like an ungrateful child who had gone the way of the world and forgotten his God and his people and their efforts to raise him in the faith. Moses here pays tribute to them. What a surprise awaits them in the Kingdom! 
15:4 Pharaoh’s men ran into the Sea themselves in hot pursuit of Israel; but God confirmed them in that desire, so in a sense He cast them into the Sea. There is strong emphasis on the image of God throwing or casting the Egyptians into the Red Sea (15:1,21); God confirms people in the way they wish to go, in the heart they wish to have.
15:11 Among the gods- The Egyptian gods had been declared dead or powerless by the plagues. Israel enthusiastically sung of Yahweh’s excellence above these gods; and yet they still carried the idols who represented those gods with them, and worshipped them (Ez. 20:7,8; Acts 7:42,43). It’s one thing to enthusiastically sing of God’s truths in the words of hymns and songs, but to live out those words in daily life is quite another. 
15:15 Are melted away- So the people enthusiastically sung, and so it was in reality, as reported by Rahab (Josh. 2:9-11). But when Israel came to enter Canaan, they preferred to believe that the people there hadn’t melted away at all, but were far too strong for them (Num. 13:30-33). Israel's hearts "melted" for fear of those melting Canaanites (Josh. 14:8). Again, we can loudly sing of God’s power over all that might be obstacles in our path to entering the Kingdom, but to live and feel this in continual daily life is something else.
15:22 Soon after their baptism at the Red Sea, God gave His people tests. This is often seen in the lives of those baptized into Christ.
15:24 Murmured- We are specifically told not to murmur as they did (1 Cor. 10:10). They soon lost the intensity of joyful faith they had when they sung the Song of Moses earlier in this chapter. We too struggle to keep the intensity of faith which we have at some specific moments. 
15:27 The Israelites in their twelve tribes must have marvelled at God’s gracious providence when they came across twelve wells in the desert, one for each tribe. In our wilderness journeys we too at times are amazed by God’s kind providence. The twelve wells enabled 70 palm trees to grow. Gen. 10 listed 70 Gentile nations as the descendants of Noah’s sons after the flood, and the number is associated with the Gentile world. The implication is that Israel’s blessings were to be shared with the Gentile world. Abraham’s seed was to be a blessing to the world, and we who are in Christ are likewise that seed, and aren’t to be selfish with our spiritual blessings but share them with the surrounding world. Israel’s spiritual elitism and isolationism was exactly the opposite of what God intended.