Silsilat al-Ahadith al-Sahihah

Sayyiduna Abu Darda (may Allah be pleased with him) says: The Messenger of Allah (peace and blessings of Allah be upon him) was asked about the wealth of rulers. He (peace and blessings of Allah be upon him) said: "Whatever wealth of the rulers comes to you without you asking for it or being greedy for it, eat from it and (through it) increase your wealth."