The greatest spiritual sacrifice we can offer to God is to give Him Lordship over our lives and that is what happens when we become born again. However, this kind of spiritual sacrifice does not end at the point of conversion but is something to be done consistently and continually. When we become born again, although our spirit is made anew, our mind and bodies remain the same and until we subject them to our new spirit, they will be in constant war with each other. That is why Apostle Paul encourages you “to give your bodies to God. Let them be a living sacrifice, holy—the kind he can accept. When you think of what he has done for you, is this too much to ask?” [Romans 12:1, Living Bible].
When God decreed the offering of sacrifices to the Israelites, He gave specific instructions on what kind of sacrifice He wanted: “”Now the Lord spoke to Moses, saying, “Command the children of Israel, and say to them, ‘My offering, My food for My offerings made by fire as a sweet aroma to Me, you shall be careful to offer to Me at their appointed time.’ “And you shall say to them, ‘This is the offering made by fire which you shall offer to the Lord: two male lambs in their first year without blemish, day by day, as a regular burnt offering. The one lamb you shall offer in the morning, the other lamb you shall offer in the evening” [Numbers 28:1-4, NJKV]. Specifically we see that God instructed the Israelites to present “two male lambs without blemish”.
In the beginning the Israelites followed these instructions and offered up to God sweet smelling sacrifices. However, as God blessed them they lost their fear of God and began chasing after other gods. With time they began to corrupt the offerings that God ask them to present. Soon the priests who were in charge in leading the people started to offer to God crippled and lame animals whereas God had instructed they present lambs without blemish [Malachi 1:6-14]. That is what happens when we take our bodies and instead of offering it up to God to be used for His Glory, we take it and indulge in things that don’t bring Glory to His name.
You need to “realize that your body is the temple of the Holy Spirit, who lives in you and was given to you by God? You do not belong to yourself, for God bought you with a high price. So you must honor God with your body” [1 Corinthians 6:19-20, NLT]. It is only when you have a full grasp of this and understand that God lives in you, that you will be afraid to offer him blemished lambs. When you understand this, you will not use your bodies as instruments to please your lusts and flesh and then turn around to offer it to God. When you understand this, you will not give the bulk of our energy, time and money to the world and bring the left overs to God. When you understand this you will not dress anyhow, consume just anything, link yourself with just anyone, behave anyhow, talk anyhow and indulge in certain activities.
God was not pleased with the Israelites when they did that and He said “When you say, ‘The altar of God is not important anymore; worship of God is no longer a priority,’ that’s defiling. And when you offer worthless animals for sacrifices in worship, animals that you’re trying to get rid of—blind and sick and crippled animals—isn’t that defiling. Try a trick like that with your banker or your senator—how far do you think it will get you?” All except you. Instead of honoring me, you profane me. You profane me when you say, ‘Worship is not important, and what we bring to worship is of no account,’ and when you say, ‘I’m bored—this doesn’t do anything for me.’ You act so superior, sticking your noses in the air—act superior to me, God-of-the-Angel-Armies! And when you do offer something to me, it’s a hand-me-down, or broken, or useless. Do you think I’m going to accept it? This is God speaking to you!” [Malachi 1:7-8, 13-14, The MSG].
We can always fool man when we lead double lives even though we are born again but we cannot fool God. We were bought with a price and “God owns the whole works. So let people see God in and through your body” [1 Corinthians 6:20b, The MSG].