The “big lie” is an expression coined by Adolf Hitler to describe his propaganda technique of telling a lie so colossal that no one would believe someone "could have the impudence to distort the truth so infamously.” He first described this concept in Mein Kampf (German for "My Struggle"), the autobiographical manifesto outlining his plans for ruling Germany.
Exodus 17 tells how Amalekites, descendants of Esau’s grandson, attacked the children of Israel in the desert of Sinai during their exodus from Egypt. This unprovoked attack was especially serious and the Israelites battled all day, only achieving victory at nightfall.
In response to this demonstration of cruelty, the Lord told Moses that he would blot out the remembrance of Amalek from under heaven. Moses later recounted: “the Lord will have war with Amalek from generation to generation” (Exodus 17:16). Amalek’s attack on the children of Israel was now a perpetual war between him and the God of Israel.