1 Samuel 24:21
Swear now therefore unto me by the Lord, that thou wilt not cut off my seed after me, and that thou wilt not destroy my name out of my father’s house.
Cross-reference
In 1 Samuel 20:14-17, Jonathan asks David to show kindness to his house — here Saul makes a parallel request for his offspring.
In 1 Samuel 20:15, Jonathan asks David to show steadfast love to his house forever — a similar covenant request for kindness to descendants, which David later honors.
In Genesis 21:23, Abraham similarly asks Abimelech to swear by God not to deal falsely with his descendants — a parallel covenant request for offspring protection.
In 2 Samuel 21:6-8, David later hands over Saul's sons to the Gibeonites, seemingly violating this oath — except he spares Mephibosheth due to his oath to Jonathan, creating tension.
In Joshua 2:12, Rahab asks the spies to swear by the LORD to show kindness to her family — a nearly identical request for a covenant oath protecting descendants.