Musannaf Ibn Abi Shaybah

Hazrat Safwan bin Muhriz narrates: He says that Hazrat Jundub said: The example of the person who gives admonition and forgets himself is like that lamp which gives light to others and burns itself. Each one of you should look at what enters his stomach. Because when an animal dies, the first thing that bursts is its stomach. And each one of you should fear that between him and Paradise, even a handful of the blood of a Muslim may become a barrier.