מדרש אויף תהילים 145:10

"I shall sing to the L–rd," for He is merciful — (Exodus 34:6) "Hashem, Hashem, the G–d who is merciful and gracious", (Devarim 4:31) "For a merciful G–d is the L–rd your G–d", (Psalms 25:6) "Remember Your mercies, Hashem, etc.", (Ibid. 145:8) "Good is the L–rd to all, and His mercies are on all his works", (Daniel 9:9) "To the L–rd our G–d is mercy and forgiveness."