Mishnah — Seder Nezikin, Tractate ShevuotChapter 1…
“ The punishment of excision, or karet, is the subject of some dispute among rabbinic authorities. It either represents an early death, childlessness, or a post-mortem spiritual punishment. Sent He-goat: A unique service performed on Yom Kippur, the Sent He-goat is selected out of a pair by lottery, after which it is sent off to "carry the sins" of Israel to the wilderness; there it is killed by a fall from a cliff. ”
