Anyone who works for someone else deserves to be paid for it, if not in cash, then in kind. The source is Luke, x, 7. Jesus sent seventy disciples in pairs to every town that he intended to visit himself. He told them before they went that they were to spread the news of the right of God and heal the sick. ‘And into whatsoever house ye enter, first say Peace be to this house. And if the son of peace be there, your peace shall rest upon it … And in the same house remain, eating and drinking such things as they give; for the labourer is worthy of his hire.’ In this context a labourer was one who worked in the service of God.
