Imam Ali (as): If you want an oppressor to take an oath, ask him to swear that he is out of Allah's might and His power [if he is not telling the truth], because if he swears falsely in this way, he will be quickly punished, while if he swears by Allah Who is such that there is no god but He, he will not be quickly punished since he is expressing the Unity of Allah, the Sublime. Nahj al-Balāgha