Oath: David Swears to Saul
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1 Samuel 24:21, 22
So now, swear to me by the LORD that you will not cut off my descendants or wipe out my name from my father’s house.” / So David gave his oath to Saul. Then Saul returned home, but David and his men went up to the stronghold.
2 Samuel 21:7
Now the king spared Mephibosheth son of Jonathan, the son of Saul, because of the oath before the LORD between David and Jonathan son of Saul.