It is narrated from Sayyiduna Ibn Mas'ud (may Allah be pleased with him) that when Surah Nasr was revealed to the Prophet (peace and blessings be upon him), he began to frequently make this supplication: «سُبْحَانَكَ اللّٰهُمَّ وَبِحَمْدِكَ اللّٰهُمَّ اغْفِرْ لِي إِنَّكَ أَنْتَ التَّوَّابُ» "O Allah! You are pure, and all praise is for You. O Allah! Forgive me, for You are indeed the Acceptor of repentance, the Most Merciful."