Romans 7:12-14 "So that the Torah truly is set-apart, and the command set-apart, and righteous, and good. Therefore, has that which is good become death to me? Let it not be! But the sin, that sin might be manifest, was working death in me through what is good, so that sin through the command might become an exceedingly great Sinner. For we know that the Torah is Spiritual, but I am fleshly, sold under sin."
Romans 3:31 "Do we then nullify the Torah through the belief? Let it not be! On the contrary, we establish the Torah."
Romans 7:22-23 "For I delight in the Torah of Elohim according to the inward man, but I see another law in my members, battling against the Torah of my mind, and bringing me into captivity to the law of sin which is in my members."
Romans 8:3-4 "For the Torah being powerless, in that it was weak through the flesh, Elohim, having His own Son in the likeness of flesh of sin, and concerning sin, condemned sin in the flesh, so that the righteousness of the Torah should be completed in us who do not walk according to the flesh but according to the Spirit."
Ephesians 5: 25-27 "Husbands, love your wives, as Messiah also did love the assembly and gave Himself for it, in order to set it apart and cleanse it with the washing of water by the Word, in order to present it to Himself a splendid assembly, not having spot or wrinkle or any of this sort, but that it might be set-apart and blameless." (The "washing of the water of the Word" is the baptism we undergo through obedience and observance to what Torah shows us.)
Many people will use the following to say that Torah has been done away with, but this is due to a misunderstanding of Scripture:
Romans 7:1-4 "Or do you not know, brothers – for I speak to those knowing the Torah – that the Torah rules over a man as long as he lives? For the married woman has been bound by Torah to the living husband, but if the husband dies, she is released from the Torah concerning her husband. So then, while her husband lives, she shall be called an adulteress if she becomes another man’s. But if her husband dies, she is free from that part of the Torah, so that she is not an adulteress, having become another man’s. So my brothers, you also were put to death to the Torah through the body of Messiah, for you to become another’s, the One who was raised from the dead, that we should bear fruit to Elohim."
What this passage speaks of is the changing of obedience from the "water" (the physical Torah), to the "blood," the physical being of Messiah, manifesting many things (not all things) in Torah that we are to abide by. In essence, He showed us the Spirit by which to live. This is covered in I John 5:8. Please, be aware of what extra verbiage is associated with this passage, that is not in the earliest extant manuscripts.
In Romans, chapter 14, Rav Shaul (Paul) speaks of the Hebrew calendar, when he speaks of days to observe. He did not declare that people could observe just any old day (the adoption of pagan days), but he was guiding us in the proper application of Torah -- NOT the doing away of Torah. This goes for the passage in Colossians. He was speaking of the Hebrew days of the calendar, and not to just any old days (again, the adoption of pagan days). He didn't declare Torah to be done away with. He was filling us in on the proper understanding of Torah. Many people have taken it too far in interpreting what Rav Shaul spoke of.
There is a passage in Galatians that people are prone to use to further their view that Rav Shaul was trying to say that Torah had been done away with. Galatian 3:10. is that passage. It goes into a larger argument (presentation of opinions), and it is late, as I type this. I will get to that passage, later. It is safe to say, thought, that Galatians actually shows great support for the observance of Torah, rather than its being done away with.
There are several other passages that indicate Rav Shaul's support of Torah. They can be easily found through a Google search, or via a good application like E-Sword or Bibleworks.