1 Samuel 3: 3-10.  19
Samuel hears the voice of God, calling to him in the night.  At first he does not recognise it, but Eli helps him to understand. 

1 Corinthians 6: 13-15. 17-20
Paul exhorts Christians in Corinth to live our their calling faithfully and to remember that they belong to God, body and spirit. 

John 1: 35-42
The disciples are called to follow Jesus.