This tells me only of its slaughtering. Whence do I derive the same for the receiving of its blood and the sprinkling of the blood? From (1) "and you shall make the Pesach."
I might think to include ("in the name of Pesach") the burning of its fats; it is, therefore, written "and you shall slaughter."
Slaughtering was in the general category (of "making"). Why was it singled out (for special mention)? To serve as a basis for comparison, viz.: Just as slaughtering is distinct in being categorically required for atonement, so, all that is so required (is included) — to exclude the burning of the fats, which is not thus required.