John Gill's Bible Commentary Ver. 6. Then the chief of the fathers and princes of the tribes of Israel, etc.] The princes of the twelve tribes: and the captains of thousands, and of hundreds, with the rulers over the king’s work; who were now assembled, ( 1 Chronicles 28:1) offered willingly; and cheerfully; needed no more arguments to press them to it, but at once readily communicated.
Matthew Henry Commentary
Verses 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 goo 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 woul draw others to good, must lead the way themselves.
Original Hebrew ויתנדבו5068 שׂרי8269 האבות1 ושׂרי8269 שׁבטי7626 ישׂראל3478 ושׂרי8269 האלפים505 והמאות3967 ולשׂרי8269 מלאכת4399 המלך׃4428