“But Jesus held his peace. And the high priest answered and said unto him, I adjure thee by the living God, that thou tell us whether thou be the Christ, the Son of God.”
King James Version (KJV)
Mt 26:63 I adjure thee, etc. This was the formula for an oath. The High Priest, contrary to the principle of law which forbids that a prisoner shall be compelled to criminate himself, called on Jesus to be a witness against himself. To answer yes, or no, to such a question, was to answer under oath.