'Swear' in the Bible

However, Jonathan had not heard his father make the troops swear the oath. He reached out with the end of the staff he was carrying and dipped it into the honeycomb. When he ate the honey, he had renewed energy.

Then, one of the troops said, “Your father made the troops solemnly swear, ‘The man who eats food today is cursed,’ and the troops are exhausted.”

David answered him, “I swear that women are being kept from us, as always when I go out to battle. The young men’s bodies are consecrated even on an ordinary mission, so of course their bodies are consecrated today.”

He said to his men, “I swear before the Lord: I would never do such a thing to my lord, the Lord’s anointed. I will never lift my hand against him, since he is the Lord’s anointed.”

Therefore swear to me by the Lord that you will not cut off my descendants or wipe out my name from my father’s family.”

David then asked him, “Will you lead me to these raiders?”He said, “Swear to me by God that you won’t kill me or turn me over to my master, and I will lead you to them.”