And Ishmael his son was thirteen years old, when he was circumcised in the flesh of his foreskin.
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Interpretation
Abraham and all his family were circumcised; so receiving the token of the covenant, and distinguishing themselves from other families that had no part nor lot in the matter. It was an implicit obedience; he did as God said to him, and did not ask why or wherefore.
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This thought runs through Genesis 17:23-27.