Is the supplication "There is no god but You; glory be to You, indeed I was among the wrongdoers" the supplication that the Prophet, may Allah's prayers and peace be upon him, swore that whoever recites it, Allah will relieve him?

We advise you to turn away from thinking about the whispers of Satan. What happened to you is not cause for distress, for Allah has forgiven us for what our souls speak of, as long as we do not utter it or act upon it. The Companions asked the Prophet, peace be upon him, about the existence of whispers in their souls that they considered too grave to speak of, and he said: "That is clear faith." Imam An-Nawawi explained this by saying that considering it grave to speak of is clear faith for one whose faith is complete. Ibn Taymiyyah mentioned that a believer is tested with whispers of disbelief, and the occurrence of such whispers, along with one's aversion to them and their expulsion from the heart, is part of clear faith, and it is the greatest struggle (jihad).