Who.

John 1:38
Jesus turned and saw them following. "What do you want?" He asked. They said to Him, "Rabbi" (which means Teacher), "where are You staying?"

Proverbs 30:3, 4
I have not learned wisdom, and I have no knowledge of the Holy One. . . .

Song of Solomon 5:9
How is your beloved better than others, O most beautiful among women? How is your beloved better than another, that you charge us so?

Matthew 11:3
to ask Him, "Are You the One who was to come, or should we look for someone else?"