Chapter 7

David wants to build God a house because David lives in a house but the Ark is in a tent.  David tells Nathan about this, and Nathan tells him to build the house.  God tells Nathan that very night that this is not to be.  God says He is fine as is for now, but God makes a covenant with David to make one who came from David's body king after him, who will establish David's throne forever, and who will himself build that house for God.

2021 - This is the Davidic Covenant, superimposed...no, separate from...any previous covenant.  This is between God and David.

12 When your days are fulfilled and you lie down with your fathers, I will raise up your offspring after you, who shall come from your body, and I will establish his kingdom. 13 He shall build a house for my name, and I will establish the throne of his kingdom forever. 14 I will be to him a father, and he shall be to me a son. When he commits iniquity, I will discipline him with the rod of men, with the stripes of the sons of men, 15 but my steadfast love will not depart from him, as I took it from Saul, whom I put away from before you. 16 And your house and your kingdom shall be made sure forever before me. Your throne shall be established forever.'" [2Sa 7:12-16 ESV]

2021 - Note that a lot of this Davidic covenant is specifically about Solomon, and anticipates Solomon's fall.  BUT, God won't "break the line of David" as he did that of Saul.  And  once beyond Solomon, somewhere down the line, David's kingdom will be established forever.  The wording though, leaves plenty of room for the Age of the Gentiles.

God reveals all this to Nathan the prophet, who tells David.  This goes through vs. 17.

Beginning in 18 is the prayer of gratitude from David to God.