Matthew 18:12-14
What think you? If a man have an hundred sheep, and one of them stray, doth he not leave the ninety and nine in the mountains, and go and seek that which had strayed?
Luke 15:4
What man is there of you, possessing an hundred sheep, though he lose but one of them, will he not leave the ninety-nine in the wilderness, and go after that which is lost, until he find it?
John 6:37
Every individual which the Father giveth me will come to me; and him that cometh to me I will in nowise cast out.
John 10:16
And other sheep I have, which are not of this fold: these also I must bring, and they shall hear my voice; and there shall be one fold, one shepherd.