Walk in Christ vs walk by the Law ?
Recently, someone in a Bible study group mentioned (once again) that Christians are to keep the OT Law with its laws concerning annual feasts, weekly sabbaths, dietary commandments, etc because only those laws about animal sacrifices have been "finished".
In regards to such claims, a passage from Col 2 came to mind, which - in my understanding - tells a different story concerning believers in Christ (Christians) and their walk in Christ.
As ye have therefore received Christ Jesus the Lord, so walk ye in him: Rooted and built up in him, and stablished in the faith, as ye have been taught, abounding therein with thanksgiving.
Beware lest any man spoil you through philosophy and vain deceit, after the tradition of men, after the rudiments of the world, and not after Christ. For in him dwelleth all the fulness of the Godhead bodily. And ye are complete in him, which is the head of all principality and power: In whom also ye are circumcised with the circumcision made without hands, in putting off the body of the sins of the flesh by the circumcision of Christ: Buried with him in baptism, wherein also ye are risen with him through the faith of the operation of God, who hath raised him from the dead. And you, being dead in your sins and the uncircumcision of your flesh, hath he quickened together with him, having forgiven you all trespasses; Blotting out the handwriting of ordinances that was against us, which was contrary to us, and took it out of the way, nailing it to his cross; And having spoiled principalities and powers, he made a shew of them openly, triumphing over them in it.
Let no man therefore judge you in meat, or in drink, or in respect of an holyday, or of the new moon, or of the sabbath days: Which are a shadow of things to come; but the body is of Christ.
(The Holy Bible: King James Version. (2009). (Electronic Edition of the 1900 Authorized Version., Col 2:6–17). Bellingham, WA: Logos Research Systems, Inc.)
I would say that the requirements of the Mosaic/OT Law are not what Christians in the body of Christ are under, but rather we are to walk in the liberty from the Law which Christ has made available (cp. also Rom 3:19; 1Co 9:20-21; Gal 4:21ff; 5:18)