Matthew 18:12-14
"What think ye? If a hundred sheep belong to a certain man, and one of them goes astray, will he not leave the ninety and nine on the mountains, and, going, seek the straying one?
Luke 15:4
"What man of you, having a hundred sheep, and losing one of them, does not leave behind the ninety and nine in the wilderness, and go after the lost one, until he finds it?
John 6:37
All that the Father giveth to Me shall come to Me; and him who comes to Me I will in no wise cast out;
John 10:16
And other sheep I have, which are not of this fold: them also I must bring, and they will hear My voice; and they shall become one flock, one Shepherd.