Micah 7:18:

Who is a God like unto thee, that pardoneth iniquity, and passeth by the transgression of the remnant of his heritage? he retaineth not his anger for ever, because he delighteth in mercy.

See also:

God’s Mercy and Compassion
Objection: Sometimes God Has to Heal Someone When a Healing Evangelist Makes a Bold Claim Just to Stop People in the Audience from Backsliding or Getting Confused