1 Timothy 3:16 God was manifest in the flesh

 1 Timothy 3:16 (KJV)  And without controversy great is the mystery of godliness: God was manifest in the flesh, justified in the Spirit, seen of angels, preached unto the Gentiles, believed on in the world, received up into glory.

A better reading would be "great is the mystery of godliness which was manifest in the flesh"

The KJV rendering is the result of corrupted copy of later manuscripts in that verse. Quite well known to scholars, "beyond controversy" apparently. This is why it appears in much later Greek texts.

Ellicott's Commentary for English Readers

God was manifest in the flesh.—Here, in the most ancient authorities, the word “God” does not occur. We must, then, literally translate the Greek of the most famous and trustworthy MSS. as follows: He who was manifested in the flesh. In the later MSS., and in the great majority of the fathers who cite the passage, we certainly find Theos (“God”), as in the Received text. The substitution can be traced to no special doctrinal prejudice, but is owing, probably, to a well-meant correction of early scribes. At first sight, Theos (“God”) would be a reading easier to understand, and grammatically more exact; and in the original copies, the great similitude between ΘC (“God”)—the contracted form in which ΘEOC was written—and the relative ΘC (“He who”), would be likely to suggest to an officious scribe the very trifling alteration necessary for the easier and apparently more accurate word. Recent investigations have shown, however, beyond controversy that the oldest MSS., with scarcely an exception, contain the more difficult reading, ΘC (“He who”).