2 Timothy 3:16

All scripture--Greek, "Every Scripture," that is, Scripture in its every part. However, English Version is sustained, though the Greek article be wanting, by the technical use of the term "Scripture" being so well known as not to need the article (compare Greek, Eph 3:15; Eph 2:21). The Greek is never used of writings in general, but only of the sacred Scriptures. The position of the two Greek adjectives closely united by "and," forbids our taking the one as an epithet, the other as predicated and translated as ALFORD and ELLICOTT. "Every Scripture given by inspiration of God is also profitable." Vulgate and the best manuscripts, favor English Version. Clearly the adjectives are so closely connected that as surely as one is a predicate, the other must be so too. ALFORD admits his translation to be harsh, though legitimate. It is better with English Version to take it in a construction legitimate, and at the same time not harsh. The Greek, "God-inspired," is found nowhere else. Most of the New Testament books were written when Paul wrote this his latest Epistle: so he includes in the clause "All Scripture is God-inspired," not only the Old Testament, in which alone Timothy was taught when a child (Ti2 3:15), but the New Testament books according as they were recognized in the churches which had men gifted with "discerning of spirits," and so able to distinguish really inspired utterances, persons, and so their writings from spurious.

— Jamieson-Fausset-Brown Commentary (public domain)