Sahih Muslim · Hadith 1920

وحدثنا محمد بن المثنى، وابن، بشار قالا حدثنا محمد بن جعفر، حدثنا شعبة، ح وحدثني زهير بن حرب، حدثنا عبد الرحمن بن مهدي، حدثنا همام، جميعا عن قتادة، بهذا الإسناد قال شعبة من آخر الكهف ‏.‏ وقال همام من أول الكهف كما قال هشام.

Ubayy b. Ka'b said: Allah's Messenger (may peace be upon him) said: O Abu' al-Mundhir, do you know the verse from the Book of Allah which, according to you, is the greatest? I said: Allah and His Apostle (may peace be upon him) know best. He again said: Abu'l-Mundhir, do you know the verse from the Book of Allah which, according to you, is the greatest? I said: Allah, there is no god but He, the Living, the Eternal. Thereupon he struck me on my breast and said: May knowledge be pleasant for you, O Abu'l-Mundhir!

Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).