This book begins with seven chapters giving instructions for sacrifices. The animal you offer should be without blemish. Bring it to the entrance of the tent; the priest will take over there. Bring offerings even for unintentional sins. Also offer sacrifices for thanksgiving
Paul said, "Offer your own body as the sacrifice. Offer not only your body; offer yourself, all of yourself. Not just once, giving an animal to the priest and thinking you have accomplished what you came to do. Offer your body, your time, your effort. And your body includes your mind. Use that mind to figure out what God wants, not what the world seems to think is more important."
In this definition of sacrifice, Paul is echoing Old Testament prophets:
"'What to me is the multitude of your sacrifices?' says the Lord; 'I have had enough of burnt-offerings of rams and the fat of fed beasts; I do not delight in the blood of bulls, or of lambs, or of goats (Isaiah 1:11)'".
"For I desire steadfast love and not sacrifice, the knowledge of God rather than burnt-offerings" Hosea 6:6).