The Old Testament is Abolished

2Co 3:6  Who also hath made us able ministers of the new testament; not of the letter, but of the spirit: for the letter killeth, but the spirit giveth life.

2Co 3:7  But if the ministration of death, written and engraven in stones, was glorious, so that the children of Israel could not stedfastly behold the face of Moses for the glory of his countenance; which glory was to be done away:

2Co 3:8  How shall not the ministration of the spirit be rather glorious?

2Co 3:9  For if the ministration of condemnation be glory, much more doth the ministration of righteousness exceed in glory.

2Co 3:10  For even that which was made glorious had no glory in this respect, by reason of the glory that excelleth.

2Co 3:11  For if that which is done away was glorious, much more that which remaineth is glorious.

2Co 3:12  Seeing then that we have such hope, we use great plainness of speech:

2Co 3:13  And not as Moses, which put a vail over his face, that the children of Israel could not stedfastly look to the end of that which is abolished:

The Law of Moses was only temporary until Christ came.

Gal 3:19  Wherefore then serveth the law? It was added because of transgressions, till the seed should come to whom the promise was made; and it was ordained by angels in the hand of a mediator.

When Christ came He fulfilled the law and nailed it to His cross.

Col 2:14  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;

Col 2:15  And having spoiled principalities and powers, he made a shew of them openly, triumphing over them in it.

Col 2:16  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:

Col 2:17  Which are a shadow of things to come; but the body is of Christ.

Heb 10:9  Then said he, Lo, I come to do thy will, O God. He taketh away the first, that he may establish the second.

Jesus abolished the law in His flesh which separated Jews and Gentiles and made us all one.

Eph 2:14  For he is our peace, who hath made both one, and hath broken down the middle wall of partition between us;

Eph 2:15  Having abolished in his flesh the enmity, even the law of commandments contained in ordinances; for to make in himself of twain one new man, so making peace;

The OT has been disannulled.

Heb 7:18  For there is verily a disannulling of the commandment going before for the weakness and unprofitableness thereof.

Heb 7:19  For the law made nothing perfect, but the bringing in of a better hope did; by the which we draw nigh unto God.

Therefore, we are no longer under the OT law. 

The only parts of the OT we are under are the parts that have been carried over and repeated in the NT. 

For instance, 9 of the 10 commandments are repeated in the NT, but the Sabbath command is not, so we are not under the Sabbath law today. 

In fact the scripture specifically states we are not under the Sabbath and to let no one judge us in respect of it (Col 2:14-17).

The other parts of the OT that we are still under would be sins that all nations and men in general were judged for in the OT such as those found in Lev 18.