All quotes from the NASB
In canvassing for fiscal support from the church the apostle Paul quotes the Torah to buttress his narrative
1 Corinthians 9:9-10
For it is written in the Law of Moses, "You shall not muzzle the ox while he is threshing." God is not concerned about oxen, is He? Or is He speaking altogether for our sake? Yes, for our sake it was written, because the plowman ought to plow in hope, and the thresher to thresh in hope of sharing the crops.
1 Corinthians 9
Do you not know that those who perform sacred services eat the food of the temple, and those who attend regularly to the altar have their share from the altar?
But Paul is clear in his narratives that the Mosaic economy was fulfilled and no longer binding to the church
by abolishing in His flesh the enmity, which is the Law of commandments contained in ordinances, so that in Himself He might make the two into one new man, thus establishing peace,
having canceled out the certificate of debt consisting of decrees against us, which was hostile to us; and He has taken it out of the way, having nailed it to the cross.
For sin shall not be master over you, for you are not under law but under grace.
So why does he quote the Torah for justification seeing it was fulfilled and no longer binding?