The Prophet (Peace & Blessings of Allaah 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‘aa’ 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).