It is narrated from Hazrat Abu Saeed Khudri (may Allah be pleased with him) regarding doubt that it is intended. A man asked the narrator, "Is this hadith attributed to the Prophet (peace and blessings be upon him)?" The narrator replied, "To the best of my knowledge, it is so."
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 11349