Bible Verses About All Christians Should Be As Missionaries: With a willing heart

The children of Israel brought a freewill offering to the LORD; every man and woman, whose heart made them willing to bring for all the work, which the LORD had commanded to be made by Moses.

Then the people rejoiced, because they offered willingly, because with a perfect heart they offered willingly to the LORD: and David the king also rejoiced with great joy.

But who am I, and what is my people, that we should be able to offer so willingly as this? For all things come from you, and of your own have we given you.