v1-4: The introduction to Moses' song, referred to in 31.19, 21, 28; both a testimony against the people, and a series of prophecies. Moses taught the song to the Israelites (31.22); as they later recalled these words, they would be reminded of the promises and warnings that God had sent. The previous song was in Ex 15, when the people had come through the Red Sea. It is probably significant that, for the intervening 40 years, there is no record of any song of praise to God.
v1: Heaven and earth are witnesses; these are things that last, for the witness of the song had to last.
v2: God had inspired and anointed Moses (compare Ps 45.1; 2 Sam 23.1-2); his words therefore bring refreshment and fruitfulness.
v3-4: "I will proclaim the Name of the Lord"; the character of God is declared first, before any reference to Israel; He is great, unchangeable, reliable, perfect, just, true, righteous, upright. A central part of worship is to declare, with adoration, the very character of God. How wonderful that this God has revealed Himself, and given us the privilege of worship!
In Mal 3.14-15, Israel denied this character, claiming that God was unjust. In the N.T, Jesus Christ perfectly displayed the same character.
v5-6: Words of prophecy, as in 31.29. The people are described as corrupt, warped (or perverse), crooked, and they are therefore no longer "His children"; the Lord expects those who are His to demonstrate character as well as obedience.
He is the Lord who bought them, made them, and established them (see v6 NIV margin); they had failed to appreciate all that God had done for them. And that failure led to rebellion.
In Ex 4.22-23, Israel is described as "my son, my first-born". Here, for the first time, God is "your Father"; see also Ps 103.13; Is 9.6; 63.16; 64.8; Mal 1.6; 2.10.
v7-14: Testimony of past blessings.
v7: A consideration of past blessings should encourage devotion and obedience
v8-9: The special place of Jacob, chosen by God out of all the peoples. When the nations were divided up, Israel was at the centre, the central part of God's working on earth. This nation was God's inheritance.
v10: God's initiative in caring for His people.
v11: Eagle's wings; describing the way in which God delivered His people; Ex 19.4. Here is the practice of the parent, training the young to leave the nest. We rightly see the image of the eagle as the Father instructing His people to trust Him.
We recommend this sermon by the nineteenth century precher, C.H. Spurgeon on the subject: C. H. Spurgeon: Spurgeon's Sermons Volume 59: 1913 - Christian Classics Ethereal Library (ccel.org)
v12: "No foreign god"; an indication of God's jealousy, and the necessity of an exclusive love for Him. Israel had initially been innocent, but later fell into idolatry (see v16).
v13-14: Privilege and position; God had given wonderful things to His people. He had provided abundantly for His people. Here too was an assurance of on going blessings, but only whilst the people kept from idolatry. See also Ps 105.10-41.
v15-18: Predictions of future rebellions.
v15: Prosperity led to rebellion; kicking off self-restraint, and the restraint of God and His law. Unless we respect and esteem God, we will esteem something else.
v16-17: They pursued foreign gods, gods that should have no place in their minds, abominations, detestable idols, demons, new gods, new arrivals (see 13.2). The way to avoid such idolatry was to stick close to the true God.
v18: They deserted God; rather they should have set their hearts and minds upon Him.
v19-25: God's judgment upon a rebellious people.
v19-20: God rejected them, turning His back on them; "I will hide my face from them"; they had no faith, and that was the heart of the problem. God is more angered by His own people, than by the unbelievers, see Amos 3.2.
v21-22: "They have made me jealous...I will make them envious"; Israel would receive from God in the same way that they had treated Him.
"and angered me...I will make them angry"; their persistent disobedience had real and serious consequences.
See also Rom 10.19; 11.11; references to the Church, "not a people...a nation that has no understanding". Here we are given insight into God's plans over many centuries, into the N.T.
v23-25: The details of judgment are given so that no one will doubt that this is indeed the hand of God, when these things are fulfilled. God sends His arrows of judgment, but His strength remains undiminished.
v26-27: God's judgment upon His people is always with mercy. A remnant of Israel would always remain, as a sign of God's mercy, and a testimony to God's mercy; no one could claim to have destroyed Israel, for God would always preserve some.
v28-29: Without sense, or void of counsel; there was no understanding in them; disobedience is foolish. The blind man stumbles without a guide; the wise man looks ahead, and considers his "latter end", that is, God's rewards and punishments.
For the Christian, we need to live in the Spirit, not walking in the flesh, considering eternity, for ourselves and for others.
v30: Wisdom learns form the past. Victory and defeat had occurred by the hand of God, and would do so again.
v31-34: The unique Rock; one and only God, before whom all idols are nothing. Their rock is different from the true God; their vine from Sodom, the fruit of Gomorrah; full of poison and bitterness.
v35: It is the Lord's prerogative to bring recompense and vengeance.
v36: The Lord will judge those who are His; this means to weigh up or discern, and does not necessarily imply punishment. The Lord's people belong to Him. This means that the honour of His Name is at stake. Where the Name of God is blasphemed, then God must act; see Ezek 36.22-23, quoted in Rom 2.24.
In Is 52.5, the treatment of Israel at the hands of Gentiles similarly constitutes a blasphemy against His Name, therefore He acted in compassion.
v37-38: The folly of idolatry; "Where are your gods?" Israel had to learn that worship of another god was foolish and futile.
v39: There is no other god; words taken up later by the prophet; Is 43.11-13; 45.21, etc.
v40-42: God is not inactive; He will act against those who oppose Him.
v43: The day will come when wrongs will be put to right; God will punish the unbelieving nations, and provide atonement for His own people, and for the land.
v46-47: The people were commanded to set their hearts on these words, not to despise what God had said, but to observe and obey everything. What God had said had rebuked and challenged, but these words were "your life". The folly did occur later when the people rebelled against God, and departed from the law of God. The words of Moses' song were fulfilled.
v48-52: The Lord's final instructions to Moses. He would ascend the mountain, and view the land of Canaan, which he could not enter. Both Moses and Aaron had broken faith with God, and dishonoured Him (v51). We do see, however, that Moses prepared the people to enter into the blessing that he would miss out on; here is genuine unselfishness.