It is narrated from Hazrat Ubayy bin Ka'b (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) once asked him, "Which is the greatest verse in the Holy Qur'an?" He replied, "Allah and His Messenger know best." The Noble Prophet (peace and blessings be upon him) repeated this question several times, so Hazrat Ubayy bin Ka'b (may Allah be pleased with him) said, "Ayat al-Kursi." Upon hearing this, the Noble Prophet (peace and blessings be upon him) said, "Abul Mundhir! May knowledge be blessed for you. By Him in Whose hand is my soul, it will surely have a tongue and two lips with which it will glorify Allah at the foot of the Throne."