Today? Seriously? Your question implies parts of the Bible are now obsolete. That's how liberals justify gay marriage.
Verse 37 says, "If anyone thinks himself to be a prophet or spiritual, let him acknowledge that the things which I write to you are the commandments of the Lord."
Are you going to nullify a commandment of the Lord?
My question implies that parts of the Bible are for “time past”, parts are for “but now” and parts are for “ages to come”. It’s called rightly dividing God’s Word. (2 Tim. 2:15). You will find the way to do this as God gave to Paul, in Ephesians, Chapter 2. As far as “obsolete”, do you bring a lamb to slaughter every Sunday? There was a time for that, but not now. It is for our understanding, but not for our obedience today. Don’t get too wise by half, you yourself make parts of the Bible “obsolete” every time you exchange OT commandment for NT ones. Just how did you decide which is for today and which is not?