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?
Berean Study Bible (BSB) - John 12:34 >The crowd replied, “We have heard from the Law that the Christ will remain forever. So how can you say that the Son of Man must be lifted up? Who is this Son of Man?”
Textus Receptus (TR) - John 12:34 >Ἀπεκρίθη αὐτῷ ὁ ὄχλος, Ἡμεῖς ἠκούσαμεν ἐκ τοῦ νόμου ὅτι ὁ Χριστὸς μένει εἰς τὸν αἰῶνα· καὶ πῶς σὺ λέγεις ὅτι Δεῖ ὑψωθῆναι τὸν υἱὸν τοῦ ἀνθρώπου; Τίς ἐστιν οὗτος ὁ υἱὸς τοῦ ἀνθρώπου;