 Because Reuben was the first to engage in saving the life of his brother Joseph in God decreed that the Cities of Refuge would be set up first within the borders of the Tribe of Reuben in 

The Pirke De-Rabbi Eliezer identified Og, king of Bashan, mentioned in with Abraham’s servant Eliezer introduced in and with the unnamed steward of Abraham’s household in The Pirke De-Rabbi Eliezer told that when Abraham left Ur of the Chaldees, all the magnates of the kingdom gave him gifts, and Nimrod gave Abraham Nimrod’s first-born son Eliezer as a perpetual slave.After Eliezer had dealt kindly with Isaac by securing Rebekah to be Isaac’s wife, he set Eliezer free, and God gave Eliezer his reward in this world by raising him up to become a king — Og, king of Bashan.Rabbi Azariah in the name of Rabbi Judah ben Rabbi Simon taught that the familiarity with which God spoke with the Israelites in befit the infancy of Israel's nationhood.