Mishnayos Sanhedrin Perek 9 Mishnah 2

If one intended to kill an animal, and he killed a person standing adjacent to it, or if he intended to kill a gentile, for whose murder he is not liable to be executed in court, and he killed a Jew, or if he intended to kill non-viable newborns, for whose murder one is not liable, and he killed a viable person, the assailant is exempt from execution, since his intent was to kill one for whose murder he is not liable. If one intended to strike another on his loins, and the blow was not powerful enough to kill him if it were to land on his loins, but instead the blow landed on his chest over the victim’s heart, and it was powerful enough to kill him when it landed on his chest over his heart, and the victim died as a result of the blow, the assailant is exempt from execution, as he did not intend to strike the victim a blow that would cause his death. If he intended to strike him on his chest over his heart and the blow was powerful enough to kill him were it to land on his chest over his heart, and instead the blow landed on his loins, and it was not powerful enough to kill him when it landed on his loins, and nevertheless the victim died, the assailant is exempt. Although the assailant intended to kill the victim, the blow was not powerful enough to kill. Ostensibly, his death was not a result of the blow. If one intended to kill an adult and the blow was not powerful enough to kill the adult, and instead the blow landed on a minor, and the blow was powerful enough to kill the minor and the minor died, the assailant is exempt. If one intended to kill a minor and the blow was powerful enough to kill a minor, and the blow landed on an adult and the blow was not powerful enough to kill the adult, and nevertheless, the adult died, the assailant is exempt. But if one intended to strike another on his loins, and the blow was powerful enough to kill him were it to land on his loins, and instead the blow landed on his chest over his heart, and he died, the assailant is liable, since in any event, his intent was to kill the victim and the blow was powerful enough to kill him wherever it struck him. If one intended to strike an adult and the blow was powerful enough to kill the adult, and the blow landed on a minor and he died, the assailant is liable. Rabbi Shimon says: Even if one intended to kill this one and he killed that one, although he would be liable for killing either, he is exempt, because one is executed only if his action completely corresponded with his intent.