שולחן ערוך אורח חיים · סימן שמ״ז

English

The Transferring for Which One is Made Liable By the Torah : The Torah only makes one liable for removing an object from the private domain and placing it in the public domain, or the reverse. However, if one extends his hand into the domain with an object in it, and his friend is inside the domain and takes [the object], or if one extends his hand out of the domain with an object in it and his friend standing outside the domain takes it, where one removes and the other places, both are exempt, but it is rabbinically forbidden to do such. If one extends his hand into the domain and grabs an object from the hand of his friend who stands inside and removes the object, such that the person standing outside removed and placed by himself, he is liable and his friend is exempt but still forbidden from doing such. And even if the person standing outside is a non-Jew, this is forbidden, because it is as if you give it to him on the condition that he remove it [from the domain]. This is also the case regarding one who places his hand outside the domain and hands the object to his friend standing outside, or one who takes an object from a friend standing outside the domain and brings the object inside; in both cases, the person standing inside is liable because he both removed and placed, and the person standing outside is exempt, but his actions are forbidden.