'Alliance' in the Bible
Solomon made an alliance by marriage with Pharaoh, king of Egypt; he married Pharaoh's daughter. He brought her to the City of David until he could finish building his residence and the temple of the Lord and the wall around Jerusalem.
David went out to meet them and said, "If you come to me in peace and want to help me, then I will make an alliance with you. But if you come to betray me to my enemies when I have not harmed you, may the God of our ancestors take notice and judge!"
Jehoshaphat was very wealthy and greatly respected. He made an alliance by marriage with Ahab,
Later King Jehoshaphat of Judah made an alliance with King Ahaziah of Israel, who did evil.
Eliezer son of Dodavahu from Mareshah prophesied against Jehoshaphat, "Because you made an alliance with Ahaziah, the Lord will shatter what you have made." The ships were wrecked and unable to go to sea.
Yes, they devise a unified strategy; they form an alliance against you.
After some years have passed, they will form an alliance. Then the daughter of the king of the south will come to the king of the north to make an agreement, but she will not retain her power, nor will he continue in his strength. She, together with the one who brought her, her child, and her benefactor will all be delivered over at that time.
After entering into an alliance with him, he will behave treacherously; he will ascend to power with only a small force.