קבלה אויף במדבר 18:19

“In the beginning (Bereishit), God created” (Genesis 1:1): Rabbi Abba began and said: “On that day. the Lord made a covenant with Avram, saying” (Genesis 15:18). The covenant was said about five things: The first is circumcision, as it is stated (Genesis 17:13), “this shall be My covenant in your flesh as an eternal covenant.” The second is the rainbow, as it is stated (Genesis 9:13), “and it shall be a sign of the covenant.” The third is the covenant of salt, as it is stated (Numbers 18:19), “an everlasting covenant of salt.” The fourth is the covenant of afflictions, as it is stated (Deuteronomy 28:69), “These are the words of the covenant.” The fifth is the covenant of the priesthood, as it is stated (Numbers 25:13), “And it shall be for him, and for his offspring after him, an everlasting covenant of priesthood.”