A.T. Robertson Commentary Matthew 26:64

"Jesus said unto him, Thou hast said: nevertheless I say unto you, Henceforth ye shall see the Son of man sitting at the right hand of Power, and coming on the clouds of heaven." — Matthew 26:64 (ASV)

Thou hast said (συ ειπας). This is a Greek affirmative reply. Mark has it plainly, "I am" (ειμ). But this is not all that Jesus said to Caiaphas. He claims that the day will come when Jesus will be the Judge and Caiaphas the culprit using the prophetic language in Da 7:13 and Ps 109:1. It was all that Caiaphas wanted.