4 Bible Verses about Political Alliances, By Oaths

And if it comes about that the name of Jonathan is cut off from the family of David, the Lord will make David responsible. And Jonathan again took an oath to David, because of his love for him: for David was as dear to him as his very soul.

Now, then, give me your oath, in the name of God, that you will not be false to me or to my sons after me, but that as I have been good to you, so you will be to me and to this land where you have been living.

And they said, We saw clearly that the Lord was with you: so we said, Let there be an oath between us and you, and let us make an agreement with you; That you will do us no damage, even as we put no hand on you, and did you nothing but good, and sent you away in peace: and now the blessing of the Lord is on you. Then he made a feast for them, and they all had food and drink.read more.
And early in the morning they took an oath one to the other: then Isaac sent them away and they went on their way in peace.

So Joshua made peace with them, and made an agreement with them that they were not to be put to death: and the chiefs of the people took an oath to them. Now three days after, when they had made this agreement with them, they had word that these men were their neighbours, living near them. And the children of Israel went forward on their journey, and on the third day came to their towns. Now their towns were Gibeon and Chephirah and Beeroth and Kiriath-jearim.read more.
And the children of Israel did not put them to death, because the chiefs of the people had taken an oath to them by the Lord, the God of Israel. And all the people made an outcry against the chiefs. But all the chiefs said to the people, We have taken an oath to them by the Lord, the God of Israel, and so we may not put our hands on them. This is what we will do to them: we will not put them to death, for fear that wrath may come on us because of our oath to them.