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Easton's Bible Dictionary
It is found singly and sometimes doubly at the end of prayers (Psalm 41:13; 72:19; 89:52 ), to confirm the words and invoke the fulfilment of them. It is used in token of being bound by an oath (Numbers 5:22; Deuteronomy 27:15-26; Nehemiah 5:13; 8:6; 1 Chronicles 16:36 ). In the primitive churches it was common for the general audience to say "Amen" at the close of the prayer (1 Corinthians 14:16 ).
The promises of God are Amen; i.e., they are all true and sure (2 Corinthians 1:20 ).
These dictionary topics are from M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition, published by Thomas Nelson, 1897. Public Domain.
Easton, Matthew George. Entry for 'Amen'. Easton's Bible Dictionary. https://www.studylight.org/dictionaries/eng/ebd/a/amen.html. 1897.