In Psalm 51 David prays to be cleansed from his sin and also for a renewed heart and mind. The reason David wrote this Psalm was his adultery with Bathsheba (vs 1). Thus a sinful act. But in this Psalm we learn that David knows that the biblical definition of sin goes further than a sinful act.
In verse 2 David prays: “Wash me throughly from mine iniquity, and cleanse me from my sin.” We are cleansed by the water of His truth. Iniquity and sin are lies and delusions in our mind and heart. And these are cleansed, they disappear, when we fill our mind and heart with His truth.
In verse 3 David confesses: “For I acknowledge my transgressions”. He acknowledges it, he knows it. Knowing we do with our mind. David realizes that His truth must be in our mind, in our inward parts (verse 6). That is where YHWH makes us to know His wisdom (verse 6).
In verse 10 David prays: “Create in me a clean heart, O God; and renew a right spirit within me.” David realizes that it is all about this: a clean heart, cleansed from the lies and delusions by His truth. And a right spirit, a renewed mind by the teaching of His truth (Ephesians 4:21, 23).
This is the sacrifice YHWH truly desires! Not a sacrifice of animals, but a sacrifice of ourselves, a sacrifice of our mind and heart (vs 16, 17)! Paul writes in Romans 12:1: “I beseech you therefore, brethren, by the mercies of God, that ye present your bodies a living sacrifice, holy, acceptable unto God, which is your reasonable service.” Does Paul mean to say that we have to sacrifice our literal, physical bodies, like animals were sacrificed in the temple? Of course not! He explains further in verse 2: “And be not conformed to this world: but be ye transformed by the renewing of your mind, that ye may prove what is that good, and acceptable, and perfect, will of God.” Be transformed by the renewing of your mind. Paul repeats this in Ephesians 4:23. And Peter writes in 1 Peter 2: “As newborn babes, desire the sincere milk of the word” (verse 2). Then our ‘spiritual house’ (verse 5) is built up. And house refers to our mind. So by the truth of His Word our mind is ‘built up’. Yeshua tells us the same in Matthew 7, in the parable of the wise man that builds his house (mind) on the Rock (Yeshua). And when we build our ‘spiritual house’, we will offer up ‘spritual sacrifices’ (1 Peter 2:5). These are the same sacrifices David and Paul mean in the above mentioned texts.
How do we sacrifice our mind and heart? We sacrifice our mind and heart by offering the lies and delusions we filled our mind and heart with – and maybe want to hold on to – to Him. And by filling our mind and heart with His truth. YHWH desires sacrifices of righteousness (Psalm 51:19). And Proverbs 12:17 says: “He that speaketh truth sheweth forth righteousness”.
With this new, clean heart and mind, full of His truth, we can teach others His truth (vs 13). So others can accept His truth also and be made free from lies and delusions in their mind and heart (be converted, vs. 15).