Etiquette
33/54. Chapter:
The Virtue of (saying) None has the right to be Worshipped but Allah
Sunan Ibn Majah
حَدَّثَنَا إِبْرَاهِيمُ بْنُ الْمُنْذِرِ الْحِزَامِيُّ، حَدَّثَنَا زَكَرِيَّا بْنُ مَنْظُورٍ، حَدَّثَنِي مُحَمَّدُ بْنُ عُقْبَةَ، عَنْ أُمِّ هَانِئٍ، قَالَتْ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ " لاَ إِلَهَ إِلاَّ اللَّهُ لاَ يَسْبِقُهَا عَمَلٌ وَلاَ تَتْرُكُ ذَنْبًا " .
It was narrated that Umm Hani' said: "The Messenger of Allah(ﷺ) said: (About saying) La ilaha illah - no deed takes precedence over it and it does not leave any sin.'"
Reference : Sunan Ibn Majah 3797In-book reference : Book 33, Hadith 141English translation : Vol. 5, Book 33, Hadith 3797