"For reasons that remain obscure, in the case of the Palestinian Jews of Fustat, or Old Cairo—who worshipped in what would eventually become known as the Ben Ezra synagogue—the tradition of geniza was, it seems, extended to include the preservation of anything written in Hebrew letters, not only religious documents, and not just in the Hebrew language. Perhaps, as one scholar has proposed, "the very employment of the Hebrew script ... sanctified written material.""
January 1, 1970
https://en.wikiquote.org/wiki/Hebrew_alphabet