Majma al-Zawaid — Hadith 16409

Sayyiduna Sa'id bin Tamim (may Allah be pleased with him) narrates: I said: "O Messenger of Allah! Who are the best of your Ummah?" The Prophet (peace and blessings be upon him) said: "I and the people of my generation." I said: "O Messenger of Allah! Then who?" He said: "Then the people of the second generation." I said: "Then who, O Messenger of Allah?" The Prophet (peace and blessings be upon him) said: "Then the people of the third generation." I said: "Then who, O Messenger of Allah?" The Prophet (peace and blessings be upon him) said: "Then there will come people who will swear oaths although they were not asked to swear, who will give testimony although they were not asked to testify, and when something is entrusted to them they will not return it."
Al-Tabarani recorded it, and its narrators are thiqat (trustworthy).