Abu Hurairah Radiyallahu 'anhu narrates that Rasullullah Sallallahu 'alaihi wasallam said: For every thing there is a crest, and indeed the crest of the Qur'an is Surah Al-Baqarah. And in it there is a verse, which is the chief of all the verses in the Qur'an, and that is Ayatul kursi. (Tirmidhi: 2878)