Muwatta Malik 1820
موطأ مالك#1820SahihMalik related to me from al-Walid ibn Abdullah ibn Sayyad that al-Muttalib ibn Abdullah ibn Hantab al-Makhzumi informed him that a man asked the Messenger of Allah, may Allah bless him and grant him peace, "What is backbiting?" The Messenger of Allah, may Allah bless him and grant him peace, said, "It is to mention about a man what he does not want to hear." He said, "Messenger of Allah! Even if it is true?" The Messenger of Allah, may Allah bless him and grant him peace, said, "If you utter something false, then it is slander
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Salim al-HilaliSahih Lighairihi
In-book reference: 56:10