'Swore' in the Bible

Therefore I swore to the house of Eli [that] the iniquity of the house of Eli would not be atoned for by sacrifice or by offering forever."

And Saul listened to the voice of Jonathan and swore, "{As Yahweh lives}, he will not be put to death!"

So David swore [this on oath] to Saul, and Saul went to his house, but David and his men went up to the stronghold.

Then Saul swore to her by Yahweh, "{As Yahweh lives}, {you will not be punished} for this thing."