score:3
Luke 19:10 is the most salient passage:
For the Son of Man has come to seek and to save the lost.
Jesus also refers to the "lost sheep of Israel":
Matthew 10:6: Instead, go to the lost sheep of the house of Israel.
Matthew 15:24: He replied, “I was sent only to the lost sheep of the house of Israel.”
And there are the three "lost" parables of Luke 15: the Lost Sheep, the Lost Coin, and the Lost/Prodigal Son.