duration was promised only to the covenant established by God with the seed of Abraham, which was to grow into a multitude of nations, but not to the covenant institution which God established in connection with the lineal posterity of Abraham, the twelve tribes of Israel. Everything in this institution which was of a local and limited character, and only befitted the physical Israel and the earthly Canaan, existed only so long as was necessary for the seed of Abraham to expand into a multitude of nations. So again it was only in its essence that circumcision could be a sign of the eternal covenant. Circumcision, whether it passed from Abraham to other nations, or sprang up among other nations independently of Abraham and his descendants (see my Archäologie, §63, 1), was based upon the religious view, that the sin and moral impurity which the fall of Adam had introduced into the nature of man had concentrated itself in the sexual organs, because it is in sexual life that it generally manifests itself with peculiar force; and, consequently, that for the sanctification of life, a purification or sanctification of the organ of generation, by which life is propagated, is especially required. In this way circumcision in the flesh became a symbol of the circumcision, i.e., the purification, of the heart (Deu 10:16; Deu 30:6, cf. Lev 26:41; Jer 4:4; Jer 9:25; Eze 44:7), and a covenant sign to those who received it, inasmuch as they were received into the fellowship of the holy nation (Exo 19:6), and required to sanctify their lives, in other words, to fulfil all that the covenant demanded. It was to be performed on every boy on the eighth day after its birth, not because the child, like its mother, remains so long in a state of impurity, but because, as the analogous rule with regard to the fitness of young animals for sacrifice would lead us to conclude, this was regarded as the first day of independent existence (Lev 22:27; Exo 22:29; see my Archäologie, §63).
verses 22-27
When God had finished His address and ascended again, Abraham immediately fulfilled the covenant duty enjoined upon him, by circumcision himself on that very day, along with all the male members of his house. Because Ishmael was 13 years old when he was circumcised, the Arabs even now defer circumcision to a much later period than the Jews, generally till between the ages of 5 and 13, and frequently even till the 13th year.
