and give to Solomon my son a perfect heart, to keep your commandments, your testimonies, and your statutes, and to do all these things, and to build the palace, for which I have made provision.
So David is, has told of his own commitment and now he's challenging them for a commitment of giving to God. "This is what I have done. This is what I propose to do. Now who of you are willing to offer your service unto the Lord?"