Sacred Haven of Debauchery

...Hardly grown, they begin to grow their hair and beards and take an oath not to remove this covering, which obligates them to valor, from their heads and faces until they kill an enemy. And only over his corpse and with the spoils taken from him do they reveal their faces, considering that they have finally paid in full for their birth and have become worthy of their homeland and parents; and the cowardly and unmartial remain in their ugliness until the end of their days.