Oath: David Swears to Saul

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.

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.