Matthew 18:12-14
What think you? If a man has a hundred sheep, and one of them is lost, does he not leave the ninety-nine on the mountain, and go and seek for the lost one?
Luke 15:4
What man of you having a hundred sheep, and losing one of them, does not leave the ninety-nine in the wilderness, and go after the lost sheep till he finds it.
John 6:37
Every thing which the Father gives to me shall come to me, and him that comes to me I will by no means cast out;
John 10:16
And other sheep I have which are not of this fold; and them I must lead, and they shall hear my voice, and there shall be one flock, one shepherd.