Matthew 9:27
And as Jesus passed on from there, two blind men followed him, crying aloud, Have mercy on us, Son of David. Two blind men call out Son of David — the royal messianic title that the demons recognized (8:29 as Son of God) and that the Magi sought in the genealogy. The mercy they cry for is the mercy of the king for the suppliant — the mercy that belongs to David's line by covenant promise (Psalm 89:24, 28). The following while blind is its own kind of faith: they cannot see where he is going but they follow the sound of his movement. The son of David who was promised to heal the blind (Isaiah 35:5; 42:7) is being addressed by the very people his coming was supposed to benefit.