It is said that once a king started his expedition to invade some country. On the way, a pious man held the reigns of the king’s horse and said, ‘Do not go forward, or I shall fight you.’ The king was surprised [by this challenge] and asked, ‘You have no means to fight. How will you fight me?’ The pious person replied, ‘I will fight you by the weapon of morning prayers.’ The king said, ‘I cannot fight with you.’ The king abandoned his expedition and returned.
(Malfuzat, Vol. 9, p. 27)