The Amen
“For all the promises of God in him are yea, and in him Amen, unto the glory of God by us.” (2 Corinthians 1:2
“Amen” is a most remarkable word. It is transliterated directly from the Hebrew into the Greek of the New Testament and then into Latin, English, and many other languages so that it is practically a universal word. It has been called the best-known word in human speech.
https://www.icr.org/article/14895/?