"only what is to be eaten by all souls": All (labors) of ochel nefesh (food processing) override the festival, but not all offerings (aside from those which are festival-linked) override the festival. For it would follow (otherwise) viz.: If partial ochel nefesh does not override the Sabbath, partial offering (i.e., temidim and mussafim) does override the Sabbath, then, (on a festival), where all ochel nefesh overrides the festival, how much more so should all offering (even those unlinked to the festival) override the festival! It is, therefore, written "Only what is to be eaten by all souls"—All ochel nefesh overrides the festival, but not all offerings override the festival. But let partial ochel nefesh override the Sabbath, and this would follow a fortiori, viz.: If on a festival, where not all offerings override a festival, all ochel nefesh does override the festival, then, where partial offering does override the Sabbath, how much more so should partial ochel nefesh override the Sabbath! It is, therefore, written "Only what is to be eaten by all souls"—Partial offering overrides the Sabbath, but partial ochel nefesh does not override the Sabbath.