They did not realize that He had been speaking to them about the Father. [NASB]
My Translation
[my translatio]
Greek
οὐκ ἔγνωσαν ὅτι τὸν πατέρα αὐτοῖς ἔλεγεν.
Hebrew
[hebrew]
Comments
He was speaking about the Father
--
Jesus was saying to them that He spoke the words He'd heard from HIM. He did not specifically say that "Him" meant God the Father. It sounds as if they thought He may have heard from a human informant or possibly from another spirit.