John 9:36

He answered, "Who is he, sir, that I may believe in him?"

Romans 10:14

How then can they call on him in whom they have not believed? And how can they believe in him of whom they have not heard? And how can they hear without a preacher?

Matthew 11:3

and said to him, "Are you the One who is to come, or shall we look for another?"

John 1:38

Jesus turned, and saw them following, and said to them, "What do you seek?" They said to him, "Rabbi" (which means Teacher), "where are you staying?"

Treasury of Scripture Knowledge

Summary

He answered and said, Who is he, Lord, that I might believe on him?

Bible References

Who

John 1:38
Jesus turned, and saw them following, and said to them, "What do you seek?" They said to him, "Rabbi" (which means Teacher), "where are you staying?"
Matthew 11:3
and said to him, "Are you the One who is to come, or shall we look for another?"