Matthew 18:12-14
What do you yourselves think? Suppose a man gets a hundred sheep and one of them strays away, will he not leave the ninety-nine on the hills and go and look for the one that is straying?
Luke 15:4
"Which of you men, if he has a hundred sheep and has lost one of them, does not leave the ninety-nine in their pasture and go in search of the lost one till he finds it?
John 6:37
Every one whom the Father gives me will come to me, and him who comes to me I will never on any account drive away.
John 10:16
I have also other sheep--which do not belong to this fold. Those also I must bring, and they will listen to my voice; and they shall become one flock under one Shepherd.