Romans 14:5

But now that you have come to know God [as your Father], or rather, to be known by Him [as His children], how can you turn back again to the weak, cheap, elementary teachings [of the law of Moses], to which you [seem to] desire to become enslaved?

So, do not allow anyone to judge [i.e., condemn] you for what you eat, or what you drink, or regarding [your non-observance of] a [yearly] festival, or a [monthly] "new moon" observance, or a [weekly] Sabbath day.

As one who is in [fellowship with] the Lord Jesus, I am fully convinced that nothing in itself is [ceremonially] unclean. But to the person who considers something [ceremonially] unclean, it then becomes unclean to him.

However, not every person knows this [truth]. For some people have been so used to an idol all this time that they still think of the idol [as a reality] when eating food that has been sacrificed to it. And their weak conscience becomes polluted. [Note: These people cannot seem to shake off the idea that somehow the idol is real, so feel guilty of wrongdoing when eating food sacrificed to it].

And this is how we will know that we are following [God's] truth, and will have assurance [of it] in our hearts and before God [as well].

You are observing [certain] days, and months, and seasons, and years [as binding religious holidays].