An-Nawawi's 40 Hadith 3
الأربعون النووية#3Not gradedعَنْ أَبِي عَبْدِ الرَّحْمَنِ عَبْدِ اللَّهِ بْنِ عُمَرَ بْنِ الْخَطَّابِ رَضِيَ اللَّهُ عَنْهُمَا قَالَ: سَمِعْت رَسُولَ اللَّهِ صلى الله عليه و سلم يَقُولُ: بُنِيَ الْإِسْلَامُ عَلَى خَمْسٍ: شَهَادَةِ أَنْ لَا إلَهَ إلَّا اللَّهُ وَأَنَّ مُحَمَّدًا رَسُولُ اللَّهِ، وَإِقَامِ الصَّلَاةِ، وَإِيتَاءِ الزَّكَاةِ، وَحَجِّ الْبَيْتِ، وَصَوْمِ رَمَضَانَ . [رَوَاهُ الْبُخَارِيُّ] ، [وَمُسْلِمٌ]
On the authority of Abdullah, the son of Umar ibn al-Khattab (ra), who said: I heard the Messenger of Allah (ﷺ) say, "Islam has been built on five [pillars]: testifying that there is no deity worthy of worship except Allah and that Muhammad is the Messenger of Allah, establishing the salah (prayer), paying the zakat (obligatory charity), making the hajj (pilgrimage) to the House, and fasting in Ramadhan." [Bukhari & Muslim]
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:
Our source carries no per-scholar grade for this narration. Please verify on Sunnah.com or with a qualified scholar before relying on it.
In-book reference: 1:3