Hebrew amen derives from '-m-n, to be firm, faithful, reliable, the same root as emet, truth, and emunah, faith. Biblical usage is juridical: in Deuteronomy 27 the Levites pronounce twelve curses from Mount Ebal and all the people answer amen after each; Numbers 5 has the suspected adulteress drink the water of bitterness and answer amen, amen, ratifying the curse on herself. Isaiah 65:16 calls God the God of amen, the God of truth. The word crossed into Greek liturgy untranslated and then into every Abrahamic service as the congregation's signature: spoken agreement that converts recitation into obligation.
The popular claim derives amen from Amun, the hidden god of Egypt, a resemblance noted since antiquity and rejected by philologists: the Hebrew root is internal and Semitic, the Egyptian name's etymology is separate, and no transmission chain exists. The coincidence is nonetheless the archive's favorite kind, a shared sound across the same river valley, and the hymnists exploited it anyway. The documented history is shorter than the rumor, as usual. The rumor is older than most documented histories, also as usual.
The claim: amen is the minimal unit of speech-power, one word that binds the speaker to another's declaration, the ratification spell, and every system of collective belief, congregation, assembly, comment section, runs on its equivalents: the seconded motion, the upvote, the retweet as amen. Verdict: the biblical usage proves the binding function, and the archive's performative wing has the framework. The word seals prayers and curses with identical indifference, which is the whole warning: ratification has no quality control. Say amen carefully. You are cosigning.
If amen makes the prayer binding, what does it do to the curse it also seals?