One of the questions I have been asking myself lately - and this comes out of the debate about same-sex unions - is how do we determine which parts of the OT are in and which are out?
I know that in one sense they are all 'in'. I also know that for many people they are almost all 'out'. A common cry about the same-sex thing is 'we don't believe in Leviticus anymore'.
John Bailie has written something that asks these sort of questions.
The thing with the OT is that sometimes Jesus reinforces the commands and actually makes them more demanding - such as in the Sermon on the Mount where he says 'you've heard you shouldn't murder, but I'm telling you not even to be angry in your heart' and so on. Then there are other commands that get done away with - the Sabbath being one. Peter's vision of the sheet with unclean animals also does away with some of the OT law - but which part? How much of it?
I'm sure that people have thought and written about this, but I'm feeling the need to get a bit more on top of it for myself.