50 Grk “shouting, saying.” The participle λέγοντες (legontes) is redundant in contemporary English and has not been translated.
51 Have mercy on us is a request for healing. It is not owed to the men. They simply ask for God’s kind grace.
52 There was a tradition in Judaism that the Son of David (Solomon) had great powers of healing (Josephus, 8.2.5 [8.42–49]).

In other versions

And as Jesus passed on from there, two blind men followed him, crying aloud, “Have mercy on us, Son of David.”

As Jesus went on from there, two blind men followed him, calling out, “Have mercy on us, Son of David!”

As Jesus went on from there, two blind men followed him, calling out, “Have mercy on us, Son of David!”

After Jesus left the girl’s home, two blind men followed along behind him, shouting, “Son of David, have mercy on us!”

And as Jesus was going away from there, two blind men followed him, crying out and saying, “Have mercy on us, Son of David!”

And when Jesus departed thence, two blind men followed him, crying, and saying, Thou Son of David, have mercy on us.

Public Domain