2 Kings - Chapter 3

In this chapter the King Joram of Israel is confronting the King of Moab, and he is assisted by the King of Judah, and the governor of Edom.  They are in difficulty, with no water and ask for help from Elisha.  Elisha says this to Joram:

"Why should I help you?” Elisha said to the king of Israel. “Go and consult those prophets that your father and mother consulted.” “No!” Joram replied. “It is the Lord who has put us three kings at the mercy of the king of Moab.” Elisha answered, “By the living Lord, whom I serve, I swear that I would have nothing to do with you if I didn't respect your ally, King Jehoshaphat of Judah.

Jehoshaphat is the King from the royal line of David. and is listed in the genealogy of Jesus in Matthew 1.  Elisha says that Joram and the governor of Edom are only safe because they are in the company of Jehoshaphat, who is covered by God's covenant's with David.

In the same way nobody can expect help from God because of who they are - we can only receive it if we are in the company of Jesus, the ultimate royal descendent of David.