A biblical false prophet was a servant of the devil attempting to lead people away from the truth. Walter Martin
Several victims were then sacrificed, and despite consistently unfavourable omens, he entered the House, deriding Spurinna as a false prophet. "The Ides of March have come," he said. "Yes, they have come," replied Spurinna, "but they have not yet gone." Suetonius
God duped you into starting a war, so He could punish you. And any preacher preaching it any other way is a lying hell-bound false prophet. Fred Phelps
I am not saying we are categorizing Ellen White in the biblical context of a false prophet. Walter Martin
The prophet himself stands under the judgment which he preaches. If he does not know that, he is a false prophet. Reinhold Niebuhr