John Gill Commentary Luke 19:10

"For the Son of man came to seek and to save that which was lost." — Luke 19:10 (ASV)

For the son of man
Meaning himself, who was truly man, and the Messiah, and which was one of his names in the Old Testament:

is come :
from heaven, into this world, being sent by the Father, and with the full consent and good will of his own:

to seek and save that which was lost :
as all his elect were in Adam, and by their own actual transgressions; and are considered as such, whilst in a state of unregeneracy: and particularly the lost sheep of the house of Israel are meant, one of which Zacchaeus was; and so the words are a reason of Christ's looking him up, and calling him by his grace, and making a discovery of himself, and an application of salvation to him; see (Matthew 18:11) .