Luke 15:4
"Which of you men, if you had one hundred sheep, and lost one of them, wouldn't leave the ninety-nine in the wilderness, and go after the one that was lost, until he found it?
WEB
What man of you, having an hundred sheep, if he lose one of them, doth not leave the ninety and nine in the wilderness, and go after that which is lost, until he find it?
KJV
What Luke 15:4 means
Jesus tells this to people who resented him for keeping company with outsiders: any shepherd would leave ninety-nine sheep to go after the one that wandered off, and that, he says, is how God feels about a single lost person.
Jesus says this to a group of religious leaders who are annoyed that he spends his time with the wrong kind of people. Instead of arguing, he asks a question anyone can answer. If you had a hundred sheep and lost one, wouldn't you leave the rest and go looking until you found it? Of course you would. That, he says, is how God treats one person who has drifted away.
It is the first of three stories he tells in a row, the lost sheep, a lost coin, and a runaway son, and each one ends the same way, with a search and then a celebration. The point is not that one sheep out of a hundred goes missing. It is that the shepherd bothers to go, that the single one is worth the trouble, and that finding it turns into joy.