Task: Question Answering
Input (English): Passage: Without Luther's backing for the uprising, many rebels laid down their weapons; others felt betrayed. Their defeat by the Swabian League at the Battle of Frankenhausen on 15 May 1525, followed by Müntzer's execution, brought the revolutionary stage of the Reformation to a close. Thereafter, radicalism found a refuge in the anabaptist movement and other religious movements, while Luther's Reformation flourished under the wing of the secular powers. Question: What did Luther deny the rebels?
Output (English): backing