Sunan At-Tirmidhi

Narrated Abu Hurairah:that the Messenger of Allah (ﷺ): ""For everything there is a hump (pinnacle) and the hump (pinnacle) of the Qur'an is Surat Al-Baqarah, in it there is an Ayah which is the master of the Ayat in the Qur'an; [it is] Ayat Al-Kursi