'Willing offering' in the Bible

every man and woman (whom their heart hath made willing to bring in for all the work which Jehovah commanded to be done by the hand of Moses) of the sons of Israel brought in a willing-offering to Jehovah.

And they take from before Moses all the heave-offering which the sons of Israel have brought in for the work of the service of the sanctuary to do it; and still they have brought in unto him a willing-offering morning by morning.