4 Bible Verses about Political Alliances, By Oaths

And Jonathan covenanteth with the house of David, and Jehovah hath sought it from the hand of the enemies of David; and Jonathan addeth to cause David to swear, because he loveth him, for with the love of his own soul he hath loved him.

and now, swear to me by God here: thou dost not lie to me, or to my continuator, or to my successor; according to the kindness which I have done with thee thou dost with me, and with the land in which thou hast sojourned.'

And they say, 'We have certainly seen that Jehovah hath been with thee, and we say, 'Let there be, we pray thee, an oath between us, between us and thee, and let us make a covenant with thee; do not evil with us, as we have not touched thee, and as we have only done good with thee, and send thee away in peace; thou art now blessed of Jehovah.' And he maketh for them a banquet, and they eat and drink,read more.
and rise early in the morning, and swear one to another, and Isaac sendeth them away, and they go from him in peace.

and Joshua maketh with them peace, and maketh with them a covenant, to keep them alive; and swear to them do the princes of the company. And it cometh to pass, at the end of three days after that they have made with them a covenant, that they hear that they are their neighbours -- that in their midst they are dwelling. And the sons of Israel journey and come in unto their cities on the third day -- and their cities are Gibeon, and Chephirah, and Beeroth, and Kirjath-Jearim -- read more.
and the sons of Israel have not smitten them, for sworn to them have the princes of the company by Jehovah God of Israel, and all the company murmur against the princes. And all the princes say unto all the company, 'We -- we have sworn to them by Jehovah, God of Israel; and now, we are not able to come against them; this we do to them, and have kept them alive, and wrath is not upon us, because of the oath which we have sworn to them.'