The supplication of Dhul-Nun

[AI] "I passed by Uthman ibn Affan in the mosque and greeted him, and he fixed his gaze on me, then he did not return my greeting. So I came to the Commander of the Believers Umar ibn al-Khattab and said twice, "Commander of the Believers, has something happened in Islam?" He said, "No, and what is that?" He said: I said, "It was only that I passed by Uthman just now in the mosque and greeted him, and he fixed his gaze on me, then he did not return my greeting." He said: Umar sent for Uthman and called him, and said, "What kept you from returning your brother's greeting?" Uthman said, "I did not do that." Saad said: I said, "Yes, you did." He said: Then he swore, and I swore. He said: Then Uthman remembered and said, "Yes, and I seek Allah's forgiveness and repent to Him. You passed by me just now while I was speaking to myself about words I had heard from the Messenger of Allah ﷺ. No, by Allah, I never remember them except that a covering comes over my sight and my heart." He said, and Saad said: "I will tell you what they were. The Messenger of Allah ﷺ mentioned to us the first supplication, then a Bedouin came and distracted him, until the Messenger of Allah ﷺ stood up, and I followed him. When I feared that he would get to his house before me, I struck the ground with my foot, and the Messenger of Allah ﷺ turned to me and said, "Who is this, Abu Ishaq?" He said: I said, "Yes, Messenger of Allah." He said, "What is it?" I said, "No, by Allah, except that you mentioned to us the first supplication, then this Bedouin came and distracted you." He said, "Yes: it is the supplication of Dhul-Nun when he was in the belly of the whale: "There is no god but You; glory be to You; indeed I was among the wrongdoers." [Al-Anbiya 87] No Muslim ever supplicates to his Lord with it for anything except that He answers him.""

مَرَرْتُ بِعُثْمَانَ بْنِ عَفَّانَ فِي الْمَسْجِدِ، فَسَلَّمْتُ عَلَيْهِ، فَمَلأ عَيْنَيْهِ مِنِّي، ثُمَّ لَمْ يَرُدَّ عَلَيَّ السَّلامَ. فَأَتَيْتُ أَمِيرَ الْمُؤْمِنِينَ عُمَرَ بْنَ الْخَطَّابِ، فَقُلْتُ: يَا أَمِيرَ الْمُؤْمِنِينَ، هَلْ حَدَثَ فِي الْإِسْلامِ شَيْءٌ؟ مَرَّتَيْنِ. قَالَ: لَا، وَمَا ذَاكَ؟ قَالَ: قُلْتُ لَا إِلا أَنِّي مَرَرْتُ بِعُثْمَانَ آنِفًا فِي الْمَسْجِدِ، فَسَلَّمْتُ عَلَيْهِ، فَمَلأ عَيْنَيْهِ مِنِّي، ثُمَّ لَمْ يَرُدَّ عَلَيَّ السَّلامَ. قَالَ: فَأَرْسَلَ عُمَرُ إِلَى عُثْمَانَ، فَدَعَاهُ، فَقَالَ: مَا مَنَعَكَ أَنْ لَا تَكُونَ رَدَدْتَ عَلَى أَخِيكَ السَّلامَ؟ قَالَ عُثْمَانُ: مَا فَعَلْتُ. قَالَ سَعْدٌ: قُلْتُ بَلَى. قَالَ: حَتَّى حَلَفَ وَحَلَفْتُ. قَالَ: ثُمَّ إِنَّ عُثْمَانَ ذَكَرَ، فَقَالَ: بَلَى، وَأَسْتَغْفِرُ اللهَ وَأَتُوبُ إِلَيْهِ. إِنَّكَ مَرَرْتَ بِي آنِفًا، وَأَنَا أُحَدِّثُ نَفْسِي بِكَلِمَةٍ سَمِعْتُهَا مِنْ رَسُولِ اللهِ ﷺ، لَا وَاللهِ مَا ذَكَرْتُهَا قَطُّ إِلا تَغَشَّى بَصَرِي وَقَلْبِي غِشَاوَةٌ. قَالَ، قَالَ سَعْدٌ: فَأَنَا أُنْبِئُكَ بِهَا. إِنَّ رَسُولَ اللهِ ﷺ ذَكَرَ لَنَا أَوَّلَ دَعْوَةٍ، ثُمَّ جَاءَ أَعْرَابِيٌّ فَشَغَلَهُ، حَتَّى قَامَ رَسُولُ اللهِ ﷺ، فَاتَّبَعْتُهُ. فَلَمَّا أَشْفَقْتُ أَنْ يَسْبِقَنِي إِلَى مَنْزِلِهِ، ضَرَبْتُ بِقَدَمِي الْأَرْضَ، فَالْتَفَتَ إِلَيَّ رَسُولُ اللهِ ﷺ فَقَالَ «مَنْ هَذَا أَبُو إِسْحَاقَ؟» قَالَ: قُلْتُ: نَعَمْ يَا رَسُولَ اللهِ. قَالَ «فَمَهْ». قَالَ: قُلْتُ: لَا وَاللهِ إِلا أَنَّكَ ذَكَرْتَ لَنَا أَوَّلَ دَعْوَةٍ، ثُمَّ جَاءَ هَذَا الْأَعْرَابِيُّ فَشَغَلَكَ. قَالَ «نَعَمْ، دَعْوَةُ ذِي النُّونِ إِذْ هُوَ فِي بَطْنِ الْحُوتِ: ﴿لَا إِلَهَ إِلا أَنْتَ سُبْحَانَكَ إِنِّي كُنْتُ مِنَ الظَّالِمِينَ﴾ [الأنبياء 87]، فَإِنَّهُ لَمْ يَدْعُ بِهَا مُسْلِمٌ رَبَّهُ فِي شَيْءٍ قَطُّ إِلا اسْتَجَابَ لَهُ»