Musannaf Ibn Abi Shaybah 37167 — The words of Umar bin al-Khattab

It is narrated from Sa'id bin Abi Burdah, who said: Sayyiduna Umar (may Allah be pleased with him) wrote to Sayyiduna Abu Musa: To proceed: The most fortunate shepherd (one in charge) is the one through whom his flock prospers, and surely the most wretched shepherd (one in charge) before Allah is the one through whom his flock is brought to misery. Beware of beginning to graze (in the wrong place), so that your officials begin to graze as well. For then your likeness before Allah will be that of an animal which looks at the greenery of the earth and begins to graze in it, its aim being to grow fat, while its death lies in its very fatness. Peace be upon you.