Hazrat Sa‘eed bin Musayyib (rahimahullah) narrates:

A certain person was once speaking ill of Hazrat ‘Ali (radhiyallahu ‘anhu), Hazrat Talhah (radhiyallahu ‘anhu) and Hazrat Zubair (radhiyallahu ‘anhu). Seeing that this person was speaking ill of the Sahaabah (radhiyallahu ‘anhum), Hazrat Sa’d (radhiyallahu ‘anhu) immediately tried to stop him saying, “Do not speak ill of my brothers!” However, the person refused to desist.