Some of the posts on this topic have dealt with the looseness of how NT authors quote / use the OT. I’ve given a couple of examples, but if you want to see how thorny the issues are, I recommend a recent book on the subject–nay, an entire commentary on this phenomenon:
I’m going to wrap up the Chicago Statement and my own statement by month’s end since I want to move on to some other things. I’m going to solicit some other biblio-bloggers to have a look at my statement when it’s “done” at month’s end to keep the tweaking going, but I want to get into some other issues. The use of the OT in the NT is very important, not only for the way we talk about the process of inspiration, but for biblical theology — so have at it!