In the Bible, Jesus Christ is many times referred to as the Good Shepherd, while his faithful, his friends and disciples, as his flock. It is also very common to see Jesus depicted with a sheep in his arms, a picture that shows love, care and protection.
In an exerpt from John (10:1-21), where Jesus is referred to as the Good Shepherd, Jesus appears to let the needs of his sheep lead his life. The same is used in all four gospels: Jesus appears to care so much for his flock that he does not allow himself to lose even a single one. The story, as found in the Gospel of John, shows that the people around Jesus had understood very clearly that He was the Son of God.