(Ambiya') 21 : 87
وَذَا النُّونِ إِذْ ذَهَبَ مُغَاضِبًا فَظَنَّ أَنْ لَنْ نَقْدِرَ عَلَيْهِ فَنَادَىٰ فِي الظُّلُمَاتِ أَنْ لَا إِلَٰهَ إِلَّا أَنْتَ سُبْحَانَكَ إِنِّي كُنْتُ مِنَ الظَّالِمِينَ
And the man of the fish, when he went off from his people in anger and thought that We have no power upon him; and he called out within the darknesses: "There is no deity except You; glory be to You, indeed I have been among the wrongdoers".
See explanation 10: 98.