Sanhedrin 85 - Striking and Cursing a Parent, Selling a Kidnapped into Slavery
One is liable for cursing a parent only if the parent is "among your people," that is, doing the deeds of your people - observing the Torah. One is liable for striking even a non-observant parent.
One who kidnaps a Jew is not liable to strangulation unless he takes him into his possession, works him, and sells him. If one kidnaps his own son, then Rabbi Ishmael makes him liable, but the Sages exempt him. If one kidnapped someone who was half slave and half freeman, Rabbi Yehudah renders him liable, but the Sages exempt him.
Art: A Slap In The Face by Salvatore Frangiamore
