Eusebius of Caesarea

Again after these a third appeared: Noah who has received testimony as 'a righteous man in his generation.' And the following will be proofs of his righteousness. A great foulness and darkness of indescribable wickedness had overtaken the whole human race, and the giants talked of by every mouth were carrying on with ungodly and impious efforts their wars with God which are still so celebrated: and already the fathers of this their brood, whether they had sprung from some condition mightier than man's nature, or in whatever way endowed, are said to have begun the teaching of curious arts among men, and to have introduced devices of witchcraft and other mischievous sorcery into their life, so that the whole human race had fallen under one sentence of judgement with God.