John 1:35-51 

Jesus is identified as the Lamb of God who takes away sin, the Messiah promised in the Scriptures, and the one whom the disciples recognize as the Son of God, the King of Israel, and the Son of Man. Disciples follow him because they see their need for him, he calls them through ordinary means like testimony and invitation, and he reveals his authority, knowledge, and saving purpose as the one who opens heaven and brings people to God. 

Mike Hutton