One of the two who heard from John that Jesus was the Son of God and the Lamb of God, and who, on that astounding intelligence, and at their teacher's own suggestion, followed (became henceforth followers of, ἀκόλουθοι) him, was Andrew, the brother of Simon Peter (notice a similar construction at John 6:45, where a clause commences with the copula).
The other disciple, with the studied reticence ever preserved about his own designation, is left unnamed by the writer. "Simon Peter" is here spoken of as the better-known man. The bestowment of this designation on Andrew shows that the Gospel was written when Peter's greater name was widely recognized, and the reference is made without the faintest touch of depreciation.
Simon Peter's reputation gives force and importance to the record of Andrew's faith. The evangelist's intimate friend Andrew is thus lifted out of his comparative obscurity among the apostolate, not by his association with John, but by his relationship with Simon.