4 Bible Verses about Political Alliances, By Oaths

So Jonathan made a covenant with the house of David, [saying], And LORD will require it at the hand of David's enemies. And Jonathan caused David to swear again, for the love that he had to him. For he loved him as he loved his own soul.

Now therefore swear to me here by God that thou will not deal falsely with me, nor with my son, nor with my son's son. But according to the kindness that I have done to thee, thou shall do to me, and to the land in which thou have

And they said, We saw plainly that LORD was with thee. And we said, Let there now be an oath between us, even between us and thee. And let us make a covenant with thee, that thou will do us no hurt, as we have not touched thee, and as we have done to thee nothing but good, and have sent thee away in peace. Thou are now the blessed of LORD. And he made a feast for them, and they ate and drank.read more.
And they rose up promptly in the morning, and swore one to another. And Isaac sent them away, and they departed from him in peace.

And Joshua made peace with them, and made a covenant with them to let them live, and the rulers of the congregation swore to them. And it came to pass at the end of three days after they had made a covenant with them, that they heard that they were their neighbors, and that they dwelt among them. And the sons of Israel journeyed, and came to their cities on the third day. Now their cities were Gibeon, and Chephirah, and Beeroth, and Kiriath-jearim.read more.
And the sons of Israel did not smite them, because the rulers of the congregation had sworn to them by LORD, the God of Israel. And all the congregation murmured against the rulers. But all the rulers said to all the congregation, We have sworn to them by LORD, the God of Israel, now therefore we may not touch them. This we will do to them, and let them live, lest wrath be upon us because of the oath which we swore to them.