Leviticus 4:18

Overview - Leviticus 4
The sin offering of ignorance;
for the priest;
13 for the congregation;
22 for the ruler;
27 for any of the people;
Treasury of Scripture Knowledge

Leviticus 4:18  (King James Version)
And he shall put some of the blood upon the horns of the altar which is before the LORD, that is in the tabernacle of the congregation, and shall pour out all the blood at the bottom of the altar of the burnt offering, which is at the door of the tabernacle of the congregation.

upon the

and shall pour out
The reason for pouring out the blood, which is so constantly and strictly required by the law, was in opposition to an idolatrous custom of the ancient Zabii, who "were accustomed to eat of the blood of their sacrifices, because they imagined this to be the food of their gods, with whom they thought they had such communion, by eating their meat, that they revealed to them future things."--Maimonides