Revelation 3:14Isaiah 65:16Revelation 3:14

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 ).