ASV: Then understood the disciples that he spake unto them of John the Baptist.
BBE: Then the disciples saw that he was talking to them of John the Baptist.
DBY: Then the disciples understood that he spoke to them of John the baptist.
KJV: Then the disciples understood that he spake unto them of John the Baptist.
WEY: Then it dawned upon the disciples that it was John the Baptist about whom He had spoken to them.
WBS: Then the disciples understood that he spoke to them concerning John the Baptist.
WEB: Then the disciples understood that he spoke to them of John the Baptizer.
YLT: Then understood the disciples that concerning John the Baptist he spake to them.
