عَنْ عَبْدِ اللَّهِ بْنِ عَمْرٍو، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " مَا عَلَى الأَرْضِ أَحَدٌ يَقُولُ لاَ إِلَهَ إِلاَّ اللَّهُ وَاللَّهُ أَكْبَرُ وَلاَ حَوْلَ وَلاَ قُوَّةَ إِلاَّ بِاللَّهِ . إِلاَّ كُفِّرَتْ عَنْهُ خَطَايَاهُ وَلَوْ كَانَتْ مِثْلَ زَبَدِ الْبَحْرِ "(ترمذی شریف/ باب : ابواب الدعوات)
Translation
The Prophet (ﷺ) said: "There is no one on earth who says: 'La ilaha illallah' (There is no god but Allah), 'Allahu Akbar' (And Allah is the Greatest), and 'Wa la hawla wa la quwwata illa billah' (And there is no power or might except with Allah), but his sins are wiped away, even if they are equal to the foam of the sea." (Tuhfat-ul-Alma'ee/Vol: 8)