"A God merciful and gracious"
After Israel's sin, when the people had turned away from God to worship the golden calf, God hears Moses' prayer of intercession and agrees to walk in the midst of an unfaithful people, thus demonstrating his love. When Moses asks to see his glory, God responds "I will make all my goodness pass before you, and will proclaim before you my name "the LORD" [YHWH]." Then the LORD passes before Moses and proclaims, "YHWH,
YHWH, a God merciful and gracious, slow to anger, and abounding in steadfast love and faithfulness"; Moses then confesses that the LORD is a forgiving God.
Source: Catechism of the Catholic Church (Vatican.va)