Verses 18 to 20 of John 13. 

“I am not saying these things to all of you; I know the ones I have chosen. But this fulfills the Scripture that says, ‘The one who eats my food has turned against me.’ I tell you this beforehand, so that when it happens you will believe that I am the Messiah. I tell you the truth, anyone who welcomes my messenger is welcoming me, and anyone who welcomes me is welcoming the Father who sent me.”