Study to shew thyself approved unto God, a workman that needeth not to be ashamed, rightly dividing the word of truth. - 2 Timothy 2:15 (KJV)
That's how the King James puts it. And no doubt, many of us have memorized (or at least, stored a paraphrased version of) this verse from the KJV. In particular, the part to "rightly divide the word of truth." Now I don't know about you, but for me, having spent my entire life in the Bible Belt, I've heard plenty a' Southern preacher proclaim this verse as a means of explaining dispensationalism. Namely, that the need to "rightly divide" the word, means to understand the difference in what was for then/them (Jews of the OT era), and what is for Believers today.