@talhatimbowyer: It was narrated that Sa‘d ibn Abi Waqqas (may Allah be pleased with him) said: The Messenger of Allah (blessings and peace of Allah be upon him) said: “The supplication of Dhu’n-Nun when he called upon Allah when he was in the belly of the fish, is: ‘La ilaha illa anta subhanaka inni kuntu min al-zalimin (There is no god worthy of worship except You. Glory be to You; I have indeed done wrong).’ No Muslim calls upon Allah with these words for any need but Allah will answer his prayer.” Narrated by al-Tirmidhi (3505) and Imam Ahmad in al-Musnad (3/65); classed as hasan by the commentators on al-Musnad; classed as sahih by Shaykh al-Albani in Sahih al-Targhib wa’l-Tarhib