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

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

Then the people rejoiced, for that they offered willingly, because with a perfect heart they offered willingly to Jehovah: 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 after this sort? for all things come of thee, and of thine own have we given thee.