One of the two which heard John [speak], and followed him, was Andrew, Simon Peter’s brother.
Berean Study Bible (BSB) - John 1:40 >Andrew, Simon Peter’s brother, was one of the two who heard John’s testimony and followed Jesus.
Textus Receptus (TR) - John 1:40 >Ἦν Ἀνδρέας ὁ ἀδελφὸς Σίμωνος Πέτρου εἷς ἐκ τῶν δύο τῶν ἀκουσάντων παρὰ Ἰωάννου καὶ ἀκολουθησάντων αὐτῷ.