Abdullah narrated to us, Ubaydullah al-Qawariri narrated to me, Jafar bin Sulayman narrated to us, Jareeri narrated to us from one of his companions, from Abdullah bin Rabah, from Ubayy that the Prophet ﷺ asked him which verse in the Book of Allah is the greatest.Ubayy replied, "Allah and His Messenger know best."The Prophet ﷺ repeated the question several times.Then Ubayy said, "The Verse of the Throne."The Prophet ﷺ said, "May knowledge bring you joy, Abu al-Mundhir. By the One in whose hand is my soul, it has a tongue and two lips that sanctify the Sovereign at the foot of the Throne."This is the wording of the hadith of my father from Abdul-Razzaq.
حدثنا عبد الرزاق أخبرنا سفيان عن سعيد الجريري عن أبي السليل
و حدثنا عبد الله حدثني عبيد الله القواريري حدثنا جعفر بن سليمان حدثنا الجريري عن بعض أصحابه عن عبد الله بن رباح عن أبي أن النبي ﷺ 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 وهذا لفظ حديث أبي عن عبد الرزاق
Its chain of transmission is sahih. The second route is among the additions of Abdullah and is daif, containing an unidentified narrator. Muslim narrated the hadith in 1/556, no. 810, in the chapter on the prayer of travelers, the merit of Ayat al-Kursi, and Abd bin Humayd in 178 of al-Muntakhab, and also Abu Dawud in 1/173, no. 146.