Leviticus 6:14-16, 26

“These are the instructions regarding the grain offering. Aaron’s sons must present this offering to the LORD in front of the altar. The priest on duty will take from the grain offering a handful of the choice flour moistened with olive oil, together with all the frankincense. He will burn this representative portion on the altar as a pleasing aroma to the LORD. Aaron and his sons may eat the rest of the flour, but it must be baked without yeast and eaten in a sacred place within the courtyard of the Tabernacle.

The priest who offers the sacrifice as a sin offering must eat his portion in a sacred place within the courtyard of the Tabernacle.