Sunan Ibn Majah, Book 7, Hadith 1796 (In-Book) ⓘ
It was narrated that ‘Abdullah bin Mas’ud said: “I rarely saw the Messenger of Allah not fasting on a Friday.”
حَدَّثَنَا إِسْحَاقُ بْنُ مَنْصُورٍ، أَنْبَأَنَا أَبُو دَاوُدَ، حَدَّثَنَا شَيْبَانُ، عَنْ عَاصِمٍ، عَنْ زِرٍّ، عَنْ عَبْدِ اللَّهِ بْنِ مَسْعُودٍ، قَالَ قَلَّمَا رَأَيْتُ رَسُولَ اللَّهِ ـ صلى الله عليه وسلم ـ يُفْطِرُ يَوْمَ الْجُمُعَةِ .
also referenced under: Hadith 1725 (Reference) & Volume 2, Book 7, Hadith 1725 (DarusSalam)