Whence is (the same derived for cooking) its flesh in its own milk? It follows a fortiori, viz.: If re shechitah (slaughtering), where "fruit" with "fruit" is permitted (i.e., it is permitted to slaughter two siblings on the same day), "fruit" (child) with mother is forbidden, then here (re cooking) where "fruit" (child) with "fruit" (milk) is forbidden, how much more so is it forbidden to cook "fruit" (milk) with mother! " so here (these are intended).