Halakha Imamat 4:27: Mishneh Torah, Leavened and Unleavened Bread, Mishneh Torah, Sabbath, Mishneh Torah, Positive Mitzvot & Sefer HaChinukh

Anyone who volitionally eats a kazayit (the size of a large olive) of chamets (leavened foods) on Passover - from the beginning of the night of the 15th until the end of the day of the 21st of Nissan is liable for excision - as it is stated (Exodus 12:15), "for anyone who eats chamets, [that soul] will be cut off." Inadvertently - one is liable for a fixed sin-offering. It is the same [for] one who eats [it] and one who liquefies [it] and drinks [it].

Any forbidden work that an individual can do by himself, but it is done by two in partnership – whether this one does part of it and that one part [of it], such as when one lifts up an object in this domain and the other puts it down in another domain; or whether the two of them did it together from beginning to end, such as when the two of them grabbed a quill and wrote or grabbed a loaf (of bread) and transported it from [one] domain to [another] domain – they are surely exempt.

We have already mentioned that one who carries from one domain to another is not liable until he picks [it] up and puts [it] down. But if he picked up but did not put down, or put down but did not pick up, he is exempt. Hence one who was standing in one of the two domains and extended his hand to the second domain and [had] an object in his hand, but someone else took it from him; or someone else put it in his hand and he brought his hand back to himself, they are both exempt – as this one picked up and that one put down.