Piacular

And while we think it ſo piaculous, to go beyond the Ancients; we muſt neceſſarily come ſhort of genuine Antiquity, Truth; unleſs we ſuppoſe them to have reach'd perfection of Knowlege in ſpight of their own acknowledgments of Ignorance.

The piacular sacrifice arose from the need of atoning for bloodshed within the kinship group ; properly speaking, the culprit himself should suffer : should he be unknown or beyond the reach of vengeance, a substitute had to be found[…]

The distinction between clean and unclean beasts and birds was made, a distinction which has its principal significance in reference to a piacular offering. Not any and everything may be offered as an atonement, but only that which is [clean].