John Chrysostom (attributed)

We pray, Give us this day our daily bread, not only that we may have what to eat, which is common to both righteous and sinners; but that what we eat we may receive at the hand of God, which belongs only to the saints. For to him God giveth bread who earns it by righteous means; but to him who earns it by sin, the Devil it is that gives. Or that inasmuch as it is given by God, it is received sanctified; and therefore He adds our, that is, such bread as we have prepared for us, that do Thou give us, that by Thy giving it may be sanctified. Like as the Priest taking bread of the laic, sanctifies it, and then offers it to him; the bread indeed is his that brought it in offering, but that it is sanctified is the benefit from the Priest. He says Our for two reasons. First, because all things that God gives us He gives through us to others, that of what we receive of Him we may impart to the helpless. Whoso then of what he gains by his own toil bestows nothing on others, eats not his own bread only, but others’ bread also. Secondly, he who eats bread got righteously, eats his own bread; but he who eats bread got with sin, eats others’ bread.