The Prophet (Peace & Blessings of Allah be upon Him) said to his companions: "Shall I not tell you some words which, if distress or grief befalls any of you and he offers this prayer (supplication), it will bring him joy? It is the du`a of Dhoo’l-Noon (i.e. Yunus or Jonah): ‘There is no god but You, Glory to You; verily I was one of the wrongdoers.’" (Saheeh al-Jaami‘, no. 2605).