Amen has other uses. Jeremiah mocks the words of a false prophet with an amen (28:6). Because God is trustworthy, Isaiah can call him "the God of amen, " in whose name his servants should invoke blessings and take oaths ( Isa 65:16 ; see also Rev 3:14 ). But Jesus' use of amen is the most striking innovation.
Jesus introduces his teaching by saying amen lego humin [ajmhvnlevgwuJmi'n], that is, "truly I say to you, " on nearly seventy occasions in the Gospels (thirty times in Matthew, thirteen in Mark, six in Luke, and twenty in John, where the amen is always doubled). Where the prophets often said, "Thus says the Lord, " Jesus often says, "Amen I say to you." Although some scholars see the formuLam merely as a method of giving emphasis to a statement, in actuality it constitutes a significant part of Jesus' implicit teaching about himself. We ought to consider Jesus' use of the term "amen" alongside his other implicit claims to deity, such as his claim of the right to forgive sins and to judge humankind, and his custom of performing miracles on his own authority. No mere human has the right to forgive sins, yet Jesus forgave sins. God is the judge of humankind, yet Jesus judges. God's agets ascribe the will and the glory to God when they perform miracles, yet Jesus performed miracles on his own authority. Likewise, prophets never spoke on their own authority. They say, "Thus says the Lord." Or, like Paul, they say they received a revelation from heaven. But Jesus says, "Truly I say to you" dozens of times, asserting that his words are certainly true because he says them.
Jesus often uses the formuLa when he corrects errors or is engaged in disputes. When Jesus instructed Nicodemus, for example, he appealed not to Scripture but to his own authority, saying "Amen, amen, I say to you" (John 3:3, 5; see also Matt 6:2, 5, 16; 18:3; Luke 13:35; John 5:19, 24, 25; 6:26, 32, 47, 53). Amen lego humin also punctuates the teaching of truths unknown in the Old Testament, and seasons startling sayings for which Jesus offers no proof other than his own authority. Here the amen implies that Jesus' words, like the Father's, are true merely because he utters them (Matt 24:34; 26:13; Mark 3:28; Luke 12:37; John 10:1). So in Matthew 5 Jesus comments on the Old Testament or Jewish interpretations of it six times in the chapter, saying, "You have heard that it was said , but I tell you." He concludes the first section with the amen in 5:26, and by so doing asserts that his authority exceeds the Jewish interpreters', and even brings a revelation that surpasses that of the Old Testament law itself.