Genesis 25:1
Then again Abraham took a wife, and her name was Keturah.
Cross-reference
Genesis 25:6 details how Abraham provided for Keturah's sons before his death, directly following the mention of his marriage to Keturah here.
In Genesis 13:16, God promises Abram countless descendants; Abraham's marriage to Keturah and the sons listed here further fulfill that promise.
Genesis 17:4 promises Abraham will be the father of many nations; Keturah's sons extend his lineage beyond Isaac and Ishmael.
Genesis 37:36 mentions Midianites, who descend from Midian, one of Keturah's sons listed here, showing her offspring's role in biblical events.
1 Chronicles 1:32 is a direct genealogical citation of Abraham's sons by Keturah, listing the same sons named in this verse.
1 Chronicles 1:33 continues the genealogical record, naming Keturah's sons Midian and Shubah, directly mirroring the names listed here.
Romans 4:17 quotes God making Abraham the father of many nations; his marriage to Keturah and her sons fulfill this promise.
Numbers 31:2 commands vengeance against the Midianites, descendants of Keturah's son Midian, linking back to Abraham's extended family.