Philo Judaeus Quod Deterius Potiori Insidiari Soleat 62

[62] But Cain here speaks arrogantly, "Am I my brother’s keeper?" For we might altogether say he was sure hereafter to lead a miserable life, if nature made you the guardian and keeper of so good a man. Do you not see that the lawgiver entrusts the keeping and preservation of the holy things not to any chance person, but to the Levites, who were the most holy persons in their opinions? for whom the earth and the air and the water were considered an unworthy inheritance, but the heaven and the whole world were looked upon as their due. And the Creator alone is worthy of these things, to whom they have fled for refuge, becoming his sincere suppliants and servants, showing their love for their master in their continued service, and in the unhesitating observance of all the commands which are laid upon them, and in the preservation of the things entrusted to them.