4 Bible Verses about Political Alliances, By Oaths

And Jonathan made a covenant with the house of David, saying, Let Jehovah even require it at the hand of David's enemies! And Jonathan caused David to swear again, by the love he had for him, for he loved him as he loved his own soul.

And now swear to me here by God that thou wilt not deal deceitfully with me, nor with my son, nor with my grandson. According to the kindness that I have done to thee, thou shalt do to me, and to the land in which thou sojournest.

And they said, We saw certainly that Jehovah is with thee; and we said, Let there be then an oath between us between us and thee, and let us make a covenant with thee, that thou wilt do us no wrong, as we have not touched thee, and as we have done to thee nothing but good, and have let thee go in peace; thou art now blessed of Jehovah. And he made them a feast, and they ate and drank.read more.
And they rose early 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 princes of the assembly swore unto 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 neighbours, and that they dwelt in their midst. And the children of Israel journeyed, and came to their cities on the third day; and their cities were Gibeon, and Chephirah, and Beeroth, and Kirjath-jearim.read more.
And the children of Israel did not smite them, because the princes of the assembly had sworn unto them by Jehovah the God of Israel. Then all the assembly murmured against the princes. And all the princes said to all the assembly, We have sworn unto them by Jehovah the God of Israel, and now we may not touch them. This we will do to them, and let them live, lest wrath come upon us, because of the oath which we swore unto them.