3 Bible Verses about Lost Sheep

For ye were going astray like sheep; but ye have now returned to the Shepherd and Bishop of your souls.

Truly, truly do I say to you, He that entereth not through the door into the sheepfold, but climbeth up some other way, the same is a thief and a robber; but he that entereth through the door is the shepherd of the sheep. To him the porter openeth; and the sheep hear his voice; and his own sheep he calleth by name, and leadeth them out.read more.
When he hath put forth all his own, he goeth before them, and the sheep follow him, because they know his voice. But a stranger they will not follow, but will flee from him; because they know not the voice of strangers. This parable Jesus spoke to them; but they did not understand what the things were which he spoke to them. Jesus therefore said, Truly, truly do I say to you, I am the door of the sheep. All those who came are thieves and robbers; but the sheep did not hear them. I am the door; if any one enter through me, he will be saved, and will go in and out, and find pasture. The thief cometh not but to steal, and to kill, and to destroy; I came that they might have life, and have abundance. I am the good shepherd; the good shepherd giveth his life for the sheep. He that is a hireling and not a shepherd, nor the owner of the sheep, seeth the wolf coming, and leaveth the sheep, and fleeth; and the wolf catcheth them, and scattereth the sheep; because he is a hireling, and careth not for the sheep. I am the good shepherd, and I know my sheep, and they know me, even as the Father knoweth me, and I know the Father; and I give my life for the sheep. 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. On this account the Father loveth me, because I lay down my life, that I may take it again. No one taketh it from me, but I lay it down of myself. I have authority to lay it down, and I have authority to take it again; this charge I received from my Father. Again there arose a division among the Jews on account of these words. Many of them said, He hath a demon, and is mad; why do ye hear him? Others said, These are not the words of one that hath a demon. Can a demon open the eyes of the blind? And the feast of the dedication came at Jerusalem. It was winter; and Jesus was walking in the temple, in Solomons porch. Then came the Jews around him, and said to him, How long dost thou hold our minds in suspense? If thou art the Christ, tell us plainly. Jesus answered them, I have told you, and ye do not believe. The works that I do in my Fathers name, these bear witness of me. But ye do not believe, because ye are not of my sheep, as I said to you. My sheep hear my voice, and I know them, and they follow me;

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?