'Covenant' in the Bible

So all the elders of Israel approached the king at Hebron, where King David entered into a covenant with them in the presence of the LORD. Then they anointed David to be king over Israel.

Meanwhile, Zadok showed up also, along with all of the descendants of Levi with him, carrying the Ark of the Covenant of God. They set down the Ark of God and Abiathar approached while all the people finished abandoning the city.

Is not my dynasty like this with God? Has he not made an eternal covenant with me, preparing every detail of it? And he has made it secure, including my complete salvation, has he not? He has been of continual help, has he not, even with respect to all of my desires?