It was among the possessions of these two and a half tribes also that Moses shortly before his death founded the cities of refuge. Moses in this instance illustrates the proverb, "Whosoever loves pious deeds, never has enough of them." Although God had told Moses that he would never cross to the other side of the Jordan, he still insisted upon at least determining the site for the asylum in the region of the East Jordan.
God gave Moses the law concerning the cities of refuge in accordance with Israel's wish. For the people said to God: "Lord of the world! Thou didst promise us a long course of life as a reward for fulfilling the commandments, but supposing now that a man hath slain another unintentionally, and the avenger of the blood slays him, he will die before his time." God then said to Moses: "As truly as thou livest, they speak wisely.
Appoint therefore several cities for cities of refuge, 'that the manslayer might flee thither, which slayeth his neighbor unawares.'" Moses rejoiced greatly at this statute, and instantly set about its execution, for "he that hath tasted of a food knoweth its flavor," and Moses who had erstwhile been obliged to flee on account of having slain an Egyptian, knew the feelings of the man who is pursued on account of a manslaughter that he had committed unawares.