John the Apostle
John 1:38BSB·traditional attribution

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

John Calvin Reformed @genevareformer

38. Rabbi. This name was commonly given to persons of high rank, or who possessed any kind of honor. But the Evangelist here points out another use of it which was made in his own age, which was, that they addressed by this name the teachers and expounders of the word of God.

Matthew Henry Presbyterian @wholebiblehenry

We have here the turning over of two disciples from John to Jesus, and one of them fetching in a third, and these are the first-fruits of Christ's disciples; see how small the church was in its beginnings, and what the dawning of the day of its great things was. I. Andrew and another with him were the two that John Baptist had directed to Christ, Joh 1:37.

Commenting on John 1:37-42

John Gill Reformed Baptist @doctorgill

Then Jesus turned, and saw them following,.... That is, "him", as the Vulgate Latin, and all the Oriental versions add: he saw by their walk, and by their countenances, that they were following him; and which he knew before he turned himself: he knew what John had said, and what an effect it had upon these disciples, and what was working in their hearts, and...