4 Bible Verses about Political Alliances, By Oaths

Jonathan made a covenant with the house of David: "May the LORD punish any violation of this covenant by the hand of David's enemies." Jonathan made David vow again out of his love for him, because he loved him as himself.

Therefore swear an oath here by God that you won't deal falsely with me, my sons, or my descendants. Just as I've dealt graciously with you, won't you do so with me and with the land in which you live as a foreigner?"

"We've seen that the LORD is with you," they responded, "so we're proposing an agreement between us between us and you. Allow us to make a treaty with you by which you'll agree not to do us any harm, just as we haven't harmed you, since we've done nothing but good for you after we sent you away in peace. As a result, you've been tremendously blessed by the LORD." So Isaac held a festival for them, and they ate and drank. read more.
They woke up early the next morning and made the treaty. After this, Isaac sent them off and they left on peaceful terms.

They made a treaty with them, guaranteeing their lives with a covenant, and the leaders of the congregation confirmed it with an oath to them. But three days after they had made the treaty with them, they learned that they were their neighbors and were living in their midst. So the Israelis set out for their cities and three days later they reached their cities of Gibeon, Chephirah, Beeroth, and Kiriath-jearim. read more.
The Israelis did not attack them, because the leaders of the congregation had made an oath with them in the name of the LORD, the God of Israel. Nevertheless, the entire congregation grumbled against their leaders. Then all of the leaders spoke to the entire congregation, "We have sworn to them in the name of the LORD, the God of Israel, and we cannot touch them. So this is what we'll do to them: we'll let them live, so that wrath won't come upon us because of the oath that we swore to them."