Mark 10:47
When he heard that it was Jesus of Nazareth, he began to shout, Jesus, Son of David, have mercy on me — the Son of David title is the messianic-royal designation — the expected deliverer who would come from David's line to restore the kingdom. Bartimaeus uses the title correctly and insistently, connecting Jesus to the Davidic promise in a way that the disciples have not yet publicly articulated. Have mercy on me is the prayer of the Psalms (Psalm 51:1, 86:3) — the simplest, most comprehensive request: mercy.