In order to comfort and encourage Israel in their dejection, Moses received directions to announce the law of sacrifices, and other precepts laid down for the life in the Holy Land, that the people might see that God did not mean to be angry with them forever. When Moses announced the laws to them, a dispute arose between the Israelites and the proselytes, because the former declared that they alone and not the others were to make offerings to God in His sanctuary. God hereupon called Moses, and said to him: "Why do these always quarrel one with another?" Moses replied: "Thou knowest why." God: "Have I not said to thee, 'One law and one ordinance shall be for you and for the stranger that sojourneth with you?'"
Sacrifice Laws Gave Israel Hope After the Calf
Legends of the Jews 4:119