And it came to pass, while he was in one of the cities, Look!—a man full of a skin disease. And when he saw Jesus, he fell on his face and implored him, saying, “Lord, if you want to, you are able to make me clean”
“Look!” The Greek word is idou (#2400 ἰδού), and it is used to get our attention. See commentary on Matthew 1:20 (“Look!).