Parallel
John 12:39
Robinson-Pierpont Byzantine Textform · Berean Standard Bible
Διὰ τοῦτο οὐκ ἠδύναντο πιστεύειν, ὅτι πάλιν εἶπεν Ἠσαΐας,
For this reason they were unable to believe. For again, Isaiah says: