John 13:25

Then leaning back against Jesus’ chest, he (John) asked Him [privately], “Lord, who is it?”

John 21:20

Peter turned and saw the disciple whom Jesus loved following them; the one who also had leaned back on His chest at the supper and had said, “Lord, who is it that is going to betray You?”

Genesis 44:4-12

When they had left the city, and were not yet far away, Joseph said to his steward, “Get up, follow after the men; and when you overtake them, say to them, ‘Why have you repaid evil [to us] for good [paid to you]?

Esther 7:5

Then King Ahasuerus (Xerxes) asked Queen Esther, “Who is he, and where is he, who dares to do such a thing?”

Treasury of Scripture Knowledge

Summary

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

General references

Bible References

Who

Genesis 44:4
When they had left the city, and were not yet far away, Joseph said to his steward, “Get up, follow after the men; and when you overtake them, say to them, ‘Why have you repaid evil [to us] for good [paid to you]?
Esther 7:5
Then King Ahasuerus (Xerxes) asked Queen Esther, “Who is he, and where is he, who dares to do such a thing?”

General references

Matthew 26:22
Being deeply grieved and extremely distressed, each one of them began to say to Him, “Surely not I, Lord?”
Luke 22:23
And they began to discuss among themselves which one of them it might be who was going to do this.