Bible Dictionary
SAYEST
“Thou sayest” is a New Testament idiom meaning “you are right” or “yes,” especially in replies to questions about Jesus’ identity. In some passages it is rendered “I am.”
Biblical Usage
The expression occurs in replies to questions concerning Jesus’ identity, including questions asked by Pilate and the high priest. It also appears in the reply to Judas and in Jesus’ answer before the council. The phrase functions as an affirmative rabbinical idiom.