Paul taught us to fulfil the righteousness of the law

ROMANS 8:3-4 (Paul)
3 For what the law could not do, in that it was weak through the flesh, God sending his own Son in the likeness of sinful flesh, and for sin, condemned sin in the flesh:4 That the righteousness of the law might be fulfilled in us, who walk not according to the flesh, but according to the Spirit.

Note: The apostle Paul is teaching here that the righteousness of the law should be fulfilled in us, but can we do this without keeping the ten commandments? No, because the psalmist said to God, "all your commandments are righteousness." (Psalm 119:172). This means that the fourth commandment, observing the Sabbath day must be righteousness, doesn't it? This completely agrees with other scriptures being put together:

(1 John 3:4) "Whoever commits sin transgresses also the law; for sin is the transgression of the law."
(1John 5:17) "All unrighteousness is sin:"

Another point is that God's righteousness requires God's law to be in our heart:

(Psalm 37:30-31) "The mouth of the righteous speaks wisdom ... The law of his God is in his heart."
(Isaiah 51:7) "Listen to me, you who know righteousness, the people in whose heart is my law;"

This righteousness fulfils the same condition as those who are partakers of the New Covenant, where God's laws are written in their heart (See #1.5). The conclusion to be drawn from all this is that all Christians are expected to grow to the place where they can fulfil the righteousness of the law in a similar manner to the way Jesus did, which would involve us keeping the ten commandments the same way that Jesus taught. So we have seen that Paul not only kept the Sabbath commandment, but taught others to keep it also, even as Jesus kept it (See #1.24); and his words for us today are, "Be you followers of me, even as I also am of Christ." (1 Corinthians 11:1).