1 Kings 2:21
And she said, Let Abishag the Shunammite be given to Adonijah thy brother to wife.
Cross-reference
2 Samuel 16:21
Historical context
2 Samuel 16:21 advises taking a king's concubine to assert power — the same political logic behind Adonijah's request for Abishag.
2 Samuel 16:22
Historical context
2 Samuel 16:22 shows Absalom actually taking the concubines, fulfilling the advice — a direct parallel to the power move Adonijah attempts.
2 Samuel 3:7
Historical context
2 Samuel 3:7 records another case of taking a royal concubine (Rizpah) to claim power — the same political strategy as Adonijah's request.