The Messenger of Allah (ﷺ) said: The supplication of Dhun-Nun (Prophet Yunus) when he supplicated, while in the belly of the whale was:

لَا إِلَهَ إِلَّا أَنْتَ سُبْحَانَكَ إِنِّي كُنْتُ مِنَ الظَّالِمِينَ

Laa 'ilaaha 'illaa 'Anta subhaanaka 'innee kuntu minadh-dhaalimeen

There is none worthy of worship but You, glory is to You. Surely, I was among the wrongdoers. So indeed, no Muslim man supplicates with it for anything, ever, except Allah responds to him. [1]

Reference: [1] Surah Ambia: 87 [2] At-Tirmidhi: 3505