The Book Pertaining to the Merits of the Companions (Allah Be Pleased With Them) of the Holy Prophet (May Peace Be Upon Him) (Kitab Al-Fada'il Al-Sahabah)
Muslim :: Book 31 : Hadith 6150
Abdullah reported Allah's Messenger (may peace be upon him) as saying: The best of my Umma would be those of the generation nearest to mine. Then those nearest to them, then those nearest to them, then people would come whose witness would precede the oath and the oath will precede the witness. Hannad has not made the mention of Qarn in his narration. Qutaiba said that, instead of the word Qaum, the word Aqwam has been used.