Ephesians 3:6

"That the Gentiles should be fellowheirs, and of the same body, and partakers of his promise in Christ by the gospel." (Ephesians 3:6)
There are many Christians who regard themselves as almost exclusively New Testament believers, arguing that the Old Testament was for the Jews under the dispensation of law and thus not applicable to Christians today. Nothing could be further from the truth. While the old animal sacrifices, temple rituals, and Levitical priesthoods have indeed been superseded by Christ's "one sacrifice for sins for ever", there are many "exceeding great and precious promises"  of the Old Testament that can be properly and joyfully appropriated by Christians. "All scripture is given by inspiration of God, and is profitable," wrote Paul, speaking particularly of the Old Testament Scriptures.