Sahih Muslim 256
صحيح مسلم#256Sahihحَدَّثَنَا عُثْمَانُ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا جَرِيرٌ، عَنِ الْحَسَنِ بْنِ عُبَيْدِ اللَّهِ، عَنْ أَبِي عَمْرٍو الشَّيْبَانِيِّ، عَنْ عَبْدِ اللَّهِ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " أَفْضَلُ الأَعْمَالِ - أَوِ الْعَمَلِ - الصَّلاَةُ لِوَقْتِهَا وَبِرُّ الْوَالِدَيْنِ " .
It is reported on the authority of 'Abdullah that the Messenger of Allah observed:The best of' the deeds or deed is the (observance of) prayer at its proper time and kindness to the parents
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 1:162