Sforno on Genesis 47:12/ספורנו על בראשית מ״ז:י״ב

1לחם לפי הטף. Even though Joseph was in a position to allocate generous rations to the members of his family, he did not show them any preference and treated them on the basis of need, each family according to the number of souls. Our sages have stated that at a time when the general population suffers shortage even those who have ample are to limit themselves.