Ab urbe condita
Titus Livius (Livy)
Livy. History of Rome, Volumes 1-2. Roberts, Canon, Rev, translator. London, New York: J. M. Dent and Sons; E. P. Dutton and Co., 1912.
and he was bound on oath not to divulge what he saw and heard in that place. Then they compelled him to take an oath couched in the most terrible language, imprecating a
curse on himself, his family, and his race if he did not go into battle where the commanders should lead him or if he either himself fled from battle or did not at once slay any one whom he saw