The Book of Virtues
قَالَ أَبُو إِسْحَاقَ حَدَّثَنَا مُحَمَّدُ بْنُ يَحْيَى، حَدَّثَنَا عَبْدُ الرَّزَّاقِ، أَخْبَرَنَا مَعْمَرٌ، بِمِثْلِ هَذَا الْحَدِيثِ .This hadith has been transmitted on the authority of Ma'mar
From Sahih Muslim, whose reports the scholars accept as authentic.