John 13:25

Being in this position, that disciple leant back on Jesus' shoulder, and asked him: "Who is it, Master?"

John 21:20

Peter turned round, and saw the disciple whom Jesus loved following--the one who at the supper leant back on the Master's shoulder, and asked him who it was that would betray him.

Treasury of Scripture Knowledge

Summary

He then lying on Jesus' breast saith unto him, Lord, who is it?

General references

Bible References

General references

Matthew 26:22
In great grief they began to say to him, one by one: "Can it be I, Master?"
Luke 22:23
Then they began questioning one another which of them it could be that was going to do this.