Al-Bazzar recorded it; he says: It is reported from Sayyiduna Umar (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Tell me, which creation will be the greatest in rank and standing in the presence of Allah Almighty on the Day of Resurrection?" The people said: "The angels." the Prophet (peace and blessings be upon him) said: "What prevents them, when they are near to their Lord? But it is someone other than them." The people said: "The Prophets." the Prophet (peace and blessings be upon him) said: "What prevents them, when revelation comes down upon them? But it is others than them." The people said: "O Messenger of Allah! Then tell us." the Prophet (peace and blessings be upon him) said: "People who will come after you; they will believe in me although they have not seen me. They will find a hanging page and believe in it. On the Day of Resurrection they will be the greatest in the presence of Allah Almighty in rank and standing (the narrator is unsure, or perhaps the words are:) in faith."
He said: The correct view is that this report is mursal, from Zayd bin Aslam. One of the two chains of al-Bazzar for the marfu' report is hasan (good); its chain contains a narrator, al-Minhal bin Bahr, whom Abu Hatim declared thiqah (trustworthy), and there is a difference of opinion about him; the rest of its narrators are the narrators of the Sahih.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب المناقب / 16690