Philo Judaeus De Confusione Linguarum 160

[160] And even if any one, rising up as it were from his ambush, were to try, but to be unable, to slay a man, still he is none the less liable to the punishment due to homicides, as the law which is enacted about such persons shows. "For if," says the law, "any one attacks his neighbour, wishing to slay him by treachery, and escapes, thou shalt apprehend him, even at the altar, to put him to death." ¹ And yet the thing condemned is the attacking with intent to kill, not the actual killing, but the law looks upon the intention to slay as equal in guilt to the actual slaying; on which account it does not grant pardon to such a man even if he supplicates for it, but bids one drag the man who has cherished so unholy a design even from the temple itself.