Vincent's NT Word Studies
35. Said unto him. Omit unto him.Dost thou believe (su pisteueiv)? The form of the question indicates the confident expectation of an affirmative answer. It is almost an affirmation, you surely believe; you (su, emphatic) who have born such bold testimony to me that they have cast you out. Note the phrase, pisteueiv eijv, believe on, and see on i. 12.
Son of God. Both Tischendorf and Westcott and Hort read Son of man.