Halakhah su Deuteronomio 33:10

It is from the roots of the commandment [that it is] because the cities of the Levites were prepared for the needs of all the other tribes; as it was the tribe that was selected for the service of God - and all of their efforts were about wisdom, as they were not preoccupied with the working of the land like the rest of the the tribes of Israel. And about them is it stated (Deuteronomy 33:10), "They shall teach Your statutes to Yaakov and Your law to Israel." And because of this - that wisdom was within them - the dealings of all of Israel were constantly with them; beside that there were among their cities, the cities of refuge for [those charged with manslaughter]. And from this also, the eyes of all of Israel were upon their cities, as a man cannot tell what [tomorrow will bring]. Hence it was appropriate that these cities - that the hand of all is equal with them and the heart of all are upon them - be of the utmost beauty and loveliness. And there is glory for all of Israel with this. And because of this, the command came about them, not to change any of their contents; for the Master of Wisdom established them, set them up and decided on their boundaries. And He saw that this was good, and [so] any reversal after His word is only detrimental and a disparagement.