Sayyiduna Sa’d (radhiyallahu ‘anhu) reports that Rasulullah (sallallahu ‘alaihi wasallam) said, “The du‘aa of Zun-Noon (Nabi Yunus [‘alaihis salaam]), which he made while in the belly of the whale, is:
لَا إِلَهَ إِلَّا أَنْتَ سُبْحَانَكَ إِنِّيْ كُنْتُ مِنَ الظَّالِمِيْنَ
There is none worty or worship but You. You are pure. Indeed, I was from among the wrongdoers.
No Muslim will ever make du‘aa through reciting these words, except that Allah Ta‘ala will accept his du‘aa.” (Sunan Tirmizi #3505)
The above words are very effective in gaining acceptance for one’s du‘aas. They are also concise and easy to recite. Hence we should recite these words whenever we make du‘aa to Allah Ta‘ala.