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.
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.