Commentaries
29:1-9 What is done in works of piety and charity, should be done willingly, not by constraint; for God loves a cheerful giver. David set a good example. This David offered, not from constraint, or for show; but because he had set his affection to the house of God, and thought he could never do enough towards promoting that good work. Those who would draw others to good, must lead the way themselves.
5. who then is willing to consecrate his service—Hebrew, "fill his hand"; that is, make an offering (Ex 32:29; Le 8:33; 1Ki 13:33). The meaning is, that whoever would contribute voluntarily, as he had done, would be offering a freewill offering to the Lord. It was a sacrifice which every one of them could make, and in presenting which the offerer himself would be the priest. David, in asking freewill offerings for the temple, imitated the conduct of Moses in reference to the tabernacle (Ex 25:1-8).