Listen carefully to what the apostle Paul says about the so-called “Old Testament”:

To Timothy, Paul writes, “and that from childhood you have known the Holy Scriptures, which are able to make you wise for salvation through faith which is in Christ Jesus. All Scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness, that the man of God may be complete, thoroughly equipped for every good work” (2 Timothy 3:15,16).

The only Scriptures Timothy could have known from childhood was the collection of books we call the “Old Testament.” Therefore, Paul is speaking of the Old Testament when he says that the Scriptures can make a person wise for salvation; is inspired of God; is useful for doctrine, reproof, correction, and training in righteousness, thus equipping the man of God for every good work.

According to the New Testament, then, doctrinal truth applicable to Christians can be derived from the Old Testament!