Even the priests of the OT had their portion in the offerings of the Israelites long ago - Leviticus 7:28-38 USCCB:
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Portions from the Communion Sacrifice for Priests. 28The LORD said to Moses:29Tell the Israelites: The person who offers a communion sacrifice to the LORD shall be the one to bring from it the offering to the LORD.30The offerer’s own hands shall carry the oblations for the LORD: the person shall bring the fat together with the brisket, which is to be raised as an elevated
q offering
* before the LORD.31The priest shall burn the fat on the altar,
r but the brisket belongs to Aaron and his sons.32Moreover, from your communion sacrifices you shall give to the priest the right leg as a contribution.33The one among Aaron’s sons who offers the blood and the fat of the communion offering shall have the right leg as his portion,34for from the communion sacrifices of the Israelites I have taken the brisket that is elevated and the leg that is a contribution, and I have given them to Aaron, the priest, and to his sons as their due from the Israelites forever.
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35This is the priestly share from the oblations for the LORD, allotted to Aaron and his sons on the day they were brought forth to be the priests of the LORD,36which the LORD ordered to be given them from the Israelites on the day they were anointed, as their due throughout their generations forever.
Summary. 37This is the ritual for the burnt offering, the grain offering, the purification offering, the reparation offering, the ordination offering,
t and the communion sacrifice,38which the LORD enjoined on Moses at Mount Sinai at the time when he commanded the Israelites in the wilderness of Sinai to bring their offerings to the LORD.
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Numbers 18:8-32 USCCB:
http://www.usccb.org/bible/numbers/18