Exodus 34:6
5 The Lord descended in the cloud and stood with him there and proclaimed the Lord by name. 6 The Lord passed by before him and proclaimed: “The Lord, the Lord, the compassionate and gracious God, slow to anger, and abounding in loyal love and faithfulness, 7 keeping loyal love for thousands, forgiving iniquity and transgression and sin. But he by no means leaves the guilty unpunished, responding to the transgression of fathers by dealing with children and children’s children, to the third and fourth generation.” 8 Moses quickly bowed to the ground and worshiped
Nahum 1:3
2 The Lord is a zealous and avenging God; the Lord is avenging and very angry. The Lord takes vengeance against his foes; he sustains his rage against his enemies. 3 The Lord is slow to anger but great in power; the Lord will certainly not allow the wicked to go unpunished. He marches out in the whirlwind and the raging storm; dark storm clouds billow like dust under his feet. 4 He shouts a battle cry against the sea and makes it dry up; he makes all the rivers run dry. Bashan and Carmel wither; the blossom of Lebanon withers. 5 The mountains tremble before him; the hills convulse; the earth is laid waste before him the world and all its inhabitants are laid waste.
Notes and References
"... Here we have a recitation, which contains replication and omission of words so that the verse has the force of an authoritative judgment. Like in Exodus 34:6-7 the context is a theophany, but unlike Exodus, it is not Yahweh making a self-declaration, but a 3rd person prophetic hymn about Yahweh. This again creates more distance, but in this case it is a powerful and judging distance, as the topic is the punishment of a foreign enemy of Israel. The credo starts off like in Exodus 34 “slow to anger,” but where we would expect “great in love it is changed to “great in power”. The BHS proposes to read it as love, but here we see the poet putting “his own stamp on the traditional formulae” and that the “original positive message was ‘vengefully reapplied’ … to underline the announcement of YHWH’s anger coming upon his enemies” ..."
Bosman, JP The Paradoxical Presence of Exodus 34:6-7 in the Book of the Twelve (pp. 233-243) Scriptura 87, 2004