And the LORD passed by before him, and {a} proclaimed, The LORD, The LORD God, merciful and gracious, longsuffering, and abundant in goodness and truth,

(a) This refers to the Lord, and not to Moses proclaiming: as Ex 33:19.

Wesley's Notes

34:6 And the Lord passed by before him - Fixed views of God are reserved for the future state; the best we have in this world are transient. And proclaimed the name of the Lord - By which he would make himself known. He had made himself known to Moses in the glory of his self - existence, and self - sufficiency, when he proclaimed that name, I am that I am; now he makes himself known in the glory of his grace and goodness, and all - sufficiency to us. The proclaiming of it notes the universal extent of God's mercy; he is not only good to Israel, but good to all. The God with whom we have to do is a great God. He is Jehovah, the Lord, that hath his being of himself, and is the fountain of all being; Jehovah - El, the Lord, the strong God, a God of almighty power himself, and the original of all power. This is prefixed before the display of his mercy, to teach us to think and to speak even of God's goodness with a holy awe, and to encourage us to depend upon these mercies. He is a good God. His greatness and goodness illustrate each other. That his greatness may not make us afraid, we are told how good he is; and that we may not presume upon his goodness, we are told how great he is. Many words are here heaped up to acquaint us with, and convince us of God's goodness. 1st, He is merciful, This speaks his pity, and tender companion, like that of a father to his children. This is put first, because it is the first wheel in all the instances of God's good - will to fallen man. 2ndly, He is gracious. This speaks both freeness, and kindness: it speaks him not only to have a compassion to his creatures, but a complacency in them, and in doing good to them; and this of his own good - will, not for the sake of any thing in them. 3dly, He is long - suffering. This is a branch of God's goodness which our wickedness gives occasion for. He is long - suffering, that is, he is slow to anger, and delays the executions of his justice, he waits to be gracious, and lengthens out the offers of his mercy. 4thly, He is abundant in goodness and truth. This speaks plentiful goodness; it abounds above our deserts, above our conception. The springs of mercy are always full, the streams of mercy always flowing; there is mercy enough in God, enough for all, enough for each, enough for ever. It speaks promised goodness, goodness and truth put together, goodness engaged by promise. 5thly, He keepeth mercy for thousands. This speaks, Mercy extended to thousands of persons. When he gives to some, still he keeps for others, and is never exhausted: Mercy entailed upon thousands of generations, even to those upon whom the ends of the world are come; nay, the line of it is drawn parallel with that of eternity itself. 6thly, He forgiveth iniquity, transgression and sin - Pardoning mercy is instanced in, because in that divine grace is most magnified, and because that it is that opens the door to all other gifts of grace. He forgives offences of all sorts, iniquity, transgression and sin, multiplies his pardons, and with him is plenteous redemption. He is a just and holy God. For, 1st, He will by no means clear the guilty. He will not clear the impenitently guilty, those that go on still in their trespasses; he will not clear the guilty without satisfaction to his justice. 2dly, He visits the iniquity of the fathers upon the children - Especially for the punishment of idolaters. Yet he keepeth not his anger for ever, but visits to the third and fourth generation only, while he keeps mercy for thousands - This is God's name for ever, and this is his memorial unto all generations.

Jamieson-Fausset-Brown Bible Commentary

6. the Lord passed by before him-in this remarkable scene, God performed what He had promised to Moses the day before.

proclaimed, The Lord . merciful and gracious-At an earlier period He had announced Himself to Moses, in the glory of His self-existent and eternal majesty, as "I am" [Ex 3:14]; now He makes Himself known in the glory of His grace and goodness-attributes that were to be illustriously displayed in the future history and experience of the church. Being about to republish His law-the sin of the Israelites being forgiven and the deed of pardon about to be signed and sealed by renewing the terms of the former covenant-it was the most fitting time to proclaim the extent of the divine mercy which was to be displayed, not in the case of Israel only, but of all who offend.

Matthew Henry's Concise Commentary

34:5-9 The Lord descended by some open token of his presence and manifestation of his glory in a cloud, and thence proclaimed his NAME; that is, the perfections and character which are denoted by the name JEHOVAH. The Lord God is merciful; ready to forgive the sinner, and to relieve the needy. Gracious; kind, and ready to bestow undeserved benefits. Long-suffering; slow to anger, giving time for repentance, only punishing when it is needful. He is abundant in goodness and truth; even sinners receive the riches of his bounty abundantly, though they abuse them. All he reveals is infallible truth, all he promises is in faithfulness. Keeping mercy for thousands; he continually shows mercy to sinners, and has treasures, which cannot be exhausted, to the end of time. Forgiving iniquity, and transgression, and sin; his mercy and goodness reach to the full and free forgiveness of sin. And will by no means clear the guilty; the holiness and justice of God are part of his goodness and love towards all his creatures. In Christ's sufferings, the Divine holiness and justice are fully shown, and the evil of sin is made known. God's forgiving mercy is always attended by his converting, sanctifying grace. None are pardoned but those who repent and forsake the allowed practice of every sin; nor shall any escape, who abuse, neglect, or despise this great salvation. Moses bowed down, and worshipped reverently. Every perfection in the name of God, the believer may plead with Him for the forgiveness of his sins, the making holy of his heart, and the enlargement of the Redeemer's kingdom.