Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) narrates: We used to come to the Prophet (peace and blessings be upon him) in turns, so that if he had some need, or wanted to send us on some errand, it could be done. Sometimes the people waiting for their turn became many. Once the Prophet (peace and blessings be upon him) came out to us while we were talking about the Dajjal, and he said: "What is this whispering? Did I not forbid you from whispering?"
Al-Bazzar recorded it, and its narrators are thiqat (trustworthy), though there is disagreement about some of them.