Deuteronomy 18:6

With all the desire of his mind With full purpose to fix his abode, and to spend his whole time and strength in the service of God. It seems, the several priests were to come from their cities to the temple by turns, before David's time; and it is certain they did so after it. But if any of them were not contented with this attendance upon God in his tabernacle, and desired more entirely and constantly to devote himself to God's service there, he was permitted so to do, because this was an eminent act of piety, joined with self-denial, to part with those great conveniences which he enjoyed in the city of his possession.