BSD A po’el brought his own avadim to work in someone else’s field. He prearranged with the field’s owner to exchange the avadim’s fruit for money. Is that permissible?
The question revolves around a few issues, which are all discussed here:
(a) how you define the poel’s work (rights vs mere charity)
(b) how far do the rights of a master over his avadim extend
(c) the avadim’s ability to give up their rights, which depends on their age.