[Philippians] 3:3 - T.R. reads 'God in spirit.' The reading was in question as early as Ambrose and Augustine. Augustine reads both. Ambrose, till the Benedictine edition, was given as reading Theo(i), 'serving God the Spirit:' but they give Theou, 'serving the Spirit of God.' The diplomatic evidence is in favour of Theou, 'who worship by the Spirit of God:' but I do not feel assured of its correctness. {aleph} has Theou; but after all {aleph} is only an Alexandrian witness of the completest kind. But it is anything but a correct manuscript. In Revelation it is very incorrect indeed. D and P (in Tisch. M.S.I.) read Theo-(i), and so Am Syrr.

J.N. Darby's Translation footnote on Philippians 3:3