It is narrated from Sayyiduna Sa'd bin Abi Waqqas (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "The supplication of Dhun-Nun (Sayyiduna Yunus, peace be upon him) which he made in the belly of the fish (is this): 'La ilaha illa anta, subhanaka inni kuntu minaz-zalimin' (There is no god but You; You are glorified; indeed I have been of the wrongdoers). The fact is that no Muslim ever supplicates with these words for any purpose except that Allah Almighty answers his supplication." This hadith has a sahih chain (sahih al-isnad), but the two Shaykhs did not record it. It has also been narrated likewise by al-Firyabi from Sufyan al-Thawri, but connecting it to Sufyan is an error of the narrator.

It is narrated from Sayyiduna Sa'd bin Abi Waqqas (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "The supplication of Dhun-Nun (peace be upon him) which he made in the belly of the fish is this: 'La ilaha illa anta, subhanaka inni kuntu minaz-zalimin' (There is no god but You; You are glorified; indeed I have been of the wrongdoers). No Muslim man supplicates with these words in any matter at all except that Allah hears his call."

It is narrated from Sayyiduna Sa'd bin Abi Waqqas (may Allah be pleased with him) that he said: We were in the presence of the Messenger of Allah (peace and blessings be upon him) when he (peace and blessings be upon him) said: "Shall I not tell you of something which, when any severe hardship or trial of this world befalls one of you and he supplicates with it, his distress will be removed?" It was said: Certainly (please tell us)! So he (peace and blessings be upon him) said: "It is the supplication of Dhun-Nun (peace be upon him): 'La ilaha illa anta, subhanaka inni kuntu minaz-zalimin' (There is no god but You; You are glorified; indeed I have been of the wrongdoers)."