Reference for Genesis 21:4

וַיָּ֤מָל אַבְרָהָם֙ אֶת־יִצְחָ֣ק בְּנ֔וֹ בֶּן־שְׁמֹנַ֖ת יָמִ֑ים כַּאֲשֶׁ֛ר צִוָּ֥ה אֹת֖וֹ אֱלֹהִֽים׃

And Abraham circumcised his son Isaac when he was eight days old, as God had commanded him.

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