Acts 2:47

The phrase ἐπὶ τὸ αὐτό (“upon the same/self”) appears in the early and some critical editions of the Greek New Testament (e.g., Nestle 1904, Westcott and Hort 1881, NA27, UBS4), indicating the daily addition of those being saved to the same self.

More Hacking

However, later manuscripts, particularly those of the Byzantine tradition, omit this phrase and instead read τῇ ἐκκλησίᾳ (“to the church/assembly”), thereby explicitly removing and adding words. Other manuscripts delete the phrase altogether. These variations reflect both scribal hacking—additions, deletions, and substitutions—and theological skewing introduced over time to undergird the institutional identity and authority of "the church."