ENOfficial
Abdullāh b. Masʿūd said, “Everything has a peak (i.e., pinnacle) and the peak of the Qur’an is al-Baqarah.” Reference: Sunan ad-Darimi 2179. Al-Silsilah al-Ṣaḥīḥah, 135/2.
Source: sunnah.com
Other translations
Arabic
وَعَنْ عَبْدِ اللَّهِ بْنِ مَسْعُودٍ أَنَّهُ قَالَ: إِنَّ لِكُلِّ شَيْءٍ سَنَامًا وَإِنَّ سَنَامَ الْقُرْآنِ سُورَةُ الْبَقَرَةِ.
sunnah.com