“As they approached, Jesus said, ‘Now here is a genuine son of Israel—a man of complete integrity.’ ‘How do you know about me?’ Nathanael asked. Jesus replied, ‘I could see you under the fig tree before Philip found you.’ Then Nathanael exclaimed, ‘Rabbi, you are the Son of God—the King of Israel!’ Jesus asked him, ‘Do you believe this just because I told you I had seen you under the fig tree? You will see greater things than this.’ Then he said, ‘I tell you the truth, you will all see heaven open and the angels of God going up and down on the Son of Man, the one who is the stairway between heaven and earth.’ ” (John 1:47-51, NLT).
Almost all the words spoken by Jesus and recorded in the Gospels quote Old Testament Scriptures or make an allusion to an Old Testament story or event. That is the case here with the calling of Nathanael as one of Jesus’ disciples.