If anyone extols Allah after every prayer thirty-three times, and praises Allah thirty-three times, and declares His Greatness thirty-three times, ninety-nine times in all, and says to complete a hundred:" There is no god but Allah, having no partner with Him, to Him belongs sovereignty and to Him is praise due, and He is Potent over everything," his sins will be forgiven even If these are as abundant as the foam of the sea. (Using translation from Muslim 597a)
قَالَ رَسُولُ اللهِ ﷺ مَنْ سَبَّحَ اللهَ فِي دُبُرِ كُلِّ صَلَاةٍ ثَلَاثًا وَثَلَاثِينَ وَحَمِدَ اللهَ ثَلَاثًا وَثَلَاثِينَ وَكَبَّرَ اللهَ ثَلَاثًا وَثَلَاثِينَ فَتِلْكَ تِسْعٌ وَتِسْعُونَ ثُمَّ قَالَ تَمَامُ الْمِائَةِ لَا إِلَهَ إِلَّا اللهُ وَحْدَهُ لَا شَرِيكَ لَهُ لَهُ الْمُلْكُ وَلَهُ الْحَمْدُ وَهُوَ عَلَى كُلِّ شَيْءٍ قَدِيرٌ غُفِرَ لَهُ خَطَايَاهُ وَإِنْ كَانَتْ مِثْلَ زَبَدِ الْبَحْرِ