In the New Testament, we have numerous instances where the missing verse(s) evidently have come from other NT books or other parts of the same book itself.
Whose fault is it that the churchgoer for decades has been less informed about the Bible that they carry than the atheists, Muslims, Mormons, Jehovah's Witnesses, and the Skeptics?
Textual variants in the New Testament are the subject of the study called textual criticism of the New Testament. Textual variants in manuscripts arise when a copyist makes deliberate or inadvertent alterations to a text that is being reproduced.
Wettstein rendered service to textual criticism by his collection of various readings and his methodical account of the manuscripts and other sources.
The sad state of affairs is that textual scholarship as a whole is unwittingly or knowingly moving the goalposts for some unknown reason. In textual criticism, it is now the earliest knowable text, the sociohistorical approach to New Testament Textual Studies, and, the newest trend of trying to redate our earliest NT papyri.
The Codex Alexandrinus (London, British Library, Royal MS 1. D. V-VIII; Gregory-Aland no. A or 02, Soden δ 4) is a fifth-century Christian manuscript of a Greek Bible, containing the majority of the Greek Old Testament and the Greek New Testament. It is one of the four Great uncial codices.
In the days of Westcott and Hort, the argument was that the Alexandrian scribes removed what we have in the Byzantine manuscripts, while the other argument was that the Byzantine scribes added and altered. How could we ever solve it once and for all?
ζητειτε την βασιλειαν αυτου
“seeking his kingdom”
ζητειτε την βασιλειαν του θεου
“seeking the kingdom of God”