Leviticus 7:11-13

Leviticus 7:11-13 (KJV)
11 And this is the law of the sacrifice of peace offerings, which he shall offer unto the Lord.
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.

Peace Offerings

Although we no longer give peace offerings to God like in the old covenant, we still give Him thanks in the way we serve Him.