Fred G. Zaspel states this:
Some OT scholars have argued that we should read and study the OT on its own terms. That is, we should seek to understand it by itself without "reading back" into it from the NT. There is a sense, of course, where that is right. But what Jesus seems to be emphasizing in these passages is that we in this age should be able to read the OT better than that. There is the matter of "historical-grammatical" interpretation, to be sure. But if "historical-grammatical" leaves out the Christological focus, it is deficient. In fact, Jesus seems to be implying that this is how the OT could always have been read! "Moses wrote of me . . . Abraham saw my day" seem to insist that the NT "revelation" is precisely the message of the OT.
Read on and enjoy how the OT and NT are unified
by Fred Zaspel