The Jews when they understood that our Lord spoke of His own death, asked how that could be: The people answered Him, We have heard out of the law that Christ abideth for ever: and how sayest Thou, The Son of man must be lifted up? Who is this Son of man? Though our Lord did not call Himself the Son of man here, they remembered that He often called Himself so; as He had just before: The hour is come, that the Son of man should be glorified. They remember this, and ask, If Christ abideth for ever, how will He be lifted up from the earth; i. e. how will He die upon the cross?
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: Tr. lii. 12