Genesis 17:25
and his son Ishmael was thirteen;
Berean Standard Bible
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Study note
Setting — The narrator records the chronological detail of Abraham’s household immediately after describing Abraham’s own circumcision at age ninety-nine. This moment occurs during the divine covenant ceremony where God establishes the sign of circumcision for all males in Abraham’s line.
The words — The Hebrew phrase בְּ/הִ֨מֹּל֔/וֹ (be./Hi.mo.L/o) translates literally as "when he was circumcised," anchoring the age of thirteen to the exact moment of the rite. The compound number שְׁלֹ֥שׁ עֶשְׂרֵ֖ה (she.Losh 'es.Reh) explicitly marks Ishmael’s age at that event.
The thread — This specific age and the simultaneous circumcision of father and son appear only in Genesis 17:24–26, establishing a unique chronological marker for the covenant's initial administration. The pattern of covenant sign applied to all males in a household recurs in Exodus 12:44–48 and Joshua 5:2–9.
Why it lands — The text demands recognition that the covenant sign applies universally to the household regardless of age or prior status. It requires the reader to acknowledge that divine commands override natural birth order or personal readiness.
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The Hebrew words
King James Version
And Ishmael his son was thirteen years old, when he was circumcised in the flesh of his foreskin.