Charles Ellicott Commentary Leviticus 11:8

"Of their flesh ye shall not eat, and their carcasses ye shall not touch; they are unclean unto you." — Leviticus 11:8 (ASV)

Of their flesh you shall not eat. —During the second Temple, the prohibition was defined to extend to the smallest quantity. If anyone ate a piece of flesh less even than the size of an olive, he was chastised with stripes.

And their carcase shall you not touch. —Contact with a human dead body, which was regarded as the most defiling of all, was forbidden only to the priests . Therefore, the prohibition here, addressed to the whole nation, was interpreted during the second Temple to apply simply to the occasions when the Israelites came to Jerusalem on the pilgrimage festivals. Contact with a carcass of an unclean animal on these visits precluded the worshipper from entering the sanctuary, from touching sacred things, and from partaking of the sacrificial meats.