“behold.” The Greek word is idou (#2400 ἰδού), and it is used to get our attention. See commentary on Matthew 1:20.
“brought to him a paralyzed man.” This record of the healing of the paralyzed man occurs in Matthew 9:2-8; Mark 2:3-12; and Luke 5:18-26.
“lying on a bed.” This was not a modern bed, but mats for sleeping.
[For more on beds in the biblical culture, see commentary on John 5:8.]
“child.” See commentary on Mark 2:5.