12 If he offer it for a thanksgiving, then he shall offer with the sacrifice of thanksgiving unleavened cakes mingled with oil, and unleavened wafers anointed with oil, and cakes mingled with oil, of fine flour, fried.
13 Besides the cakes, he shall offer for his offering leavened bread with the sacrifice of thanksgiving of his peace offerings.
14 And of it he shall offer one out of the whole oblation for an heave offering unto the Lord, and it shall be the priest’s that sprinkleth the blood of the peace offerings.
15 And the flesh of the sacrifice of his peace offerings for thanksgiving shall be eaten the same day that it is offered; he shall not leave any of it until the morning.
Today’s verses further reinforce the idea of fundamental sacrifices inside of larger ones, as we see that the meat offering was a part of the thanksgiving/peace offerings. Wherever the meat offering appears, it gives to an attribute of praise and thankfulness.
Today’s verses also give a new requirement for the priest’s portion of a sacrifice. In verse 15 it makes it clear that the portion had to be consumed on the same day that the offering was made. This requirement would certainly help ensure that this remained a part of the ritual itself, preventing it from becoming long term storage, eaten amidst other portions, with no remembrance for which sacrifice each bite belonged to.
Our solemn observations are meant to be deliberate, intentional, and specific. It would not do to vaguely wish good on others, to abstractly give thanks, to ask for forgiveness in general. That would make God and His mercy also vague, abstract, and general. But He is real, His commandments are directed, and His mercy is unique, and so we must approach Him on those terms.