Matthew 15:22

22And behold, aa Canaanite woman from that region came out and was crying, b“Have mercy on me, O Lord, Son of David; my daughter is severely oppressed by a demon.”

Matthew 20:30-31

30And behold, there were two blind men sitting by the roadside, and when they heard that Jesus was passing by, they cried out, “Lord,
Some manuscripts omit  Lord
have mercy on us, dSon of David!”
31The crowd erebuked them, telling them to be silent, but they cried out all the more, “Lord, have mercy on us, Son of David!”
Copyright information for ESV