Musannaf Ibn Abi Shaybah

It is narrated from Hazrat Saeed bin Abi Burdah that he says: Hazrat Umar (may Allah be pleased with him) wrote a letter to Hazrat Abu Musa: "Amma ba'd! Indeed, the most fortunate shepherd (leader) is the one because of whom his flock prospers, and surely, in the sight of Allah, the most unfortunate shepherd (leader) is the one because of whom his flock is in distress. Beware! Avoid that you start grazing (in the wrong place), then your workers also start grazing. Thus, your example in the sight of Allah will be like that animal which looks at the greenery of the earth and starts grazing in it, and its purpose is to become fat, while in its fatness is its death. Wassalam Alaik."