they swear by allah in the most earnest oaths that if you order them they would go forth. say do not swear known obedience . allah is aware of the things you do
وأقسموا بالله جهد أيمانهم لئن أمرتهم ليخرجن قل لا تقسموا طاعة معروفة إن الله خبير بما تعملون