Matthew 18:12-14
What seems to you? if there may be a hundred sheep to one man, and one of them may go astray, does he not, leaving the ninety and nine, going to the mountains, seek that which has gone astray?
Luke 15:4
What man of you, having a hundred sheep, and having lost one of them, does not leave the ninety and nine in the desert, and go after the lost one, until he may find it?
John 6:37
Everything which the Father giveth unto me shall come to me; and him that cometh unto me I will in no wise cast out.
John 10:16
And I have other sheep which are not of this fold: and it behooves me to bring them and they shall hear my voice, and there shall be one fold, and one shepherd.