The Greatness of Aayatul Kursi

عن أبي رضي الله عنه أن النبي صلى الله عليه وسلم سأله أي آية في كتاب الله أعظم قال الله ورسوله أعلم فرددها مرارا ثم قال أبي آية الكرسي قال ليهنك العلم أبا المنذر والذي نفسي بيده إن لها لسانا وشفتين تقدس الملك عند ساق العرش (مسند أحمد رقم 21278)

Hadhrat Ubayy (Radhiyallahu Anhu) reports that on one occasion Rasulullah (Sallallahu Alayhi Wasallam) posed the following question to him: “Which is the greatest verse in the book of Allah Ta’ala?” Hadhrat Ubayy (Radhiyallahu Anhu) replied: “Allah Ta’ala and His messenger know best.” Rasulullah (Sallallahu Alayhi Wasallam) repeated the same question few times. (After a while of reflection) Hadhrat Ubayy (Radhiyallahu Anhu) replied: “The greatest verse is Aayatul Kursi.” Rasulullah (Sallallahu Alayhi Wasallam) expressed his approval in the following words: “O Abul Mundhir, May Allah Ta’ala put barkat and blessings in your knowledge. I take a qasm on that Being in whose hands lies my soul, certainly this Aayat will have a tongue and two lips (on the day of Qiyaamah) with which it will glorify Allah Ta’ala close to the Arsh.