Matthew 18:12-14
What think ye? if a man have a hundred sheep, and one of them hath gone astray, doth he not leave the ninetynine upon the mountains, and go and seek that which hath gone astray?
Luke 15:4
What man of you having a hundred sheep, if he lose one of them, doth not leave the ninetynine in the wilderness, and go after that which is lost, until he findeth it?
John 6:37
All that the Father giveth me will come to me; and him that cometh 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 there will be one flock, one shepherd.