Then the disciples understood that he spake unto them of John the Baptist.
Berean Study Bible (BSB) - Matthew 17:13 >Then the disciples understood that He was speaking to them about John the Baptist.
Textus Receptus (TR) - Matthew 17:13 >Τότε συνῆκαν οἱ μαθηταὶ ὅτι περὶ Ἰωάννου τοῦ βαπτιστοῦ εἶπεν αὐτοῖς.