Strong H5071 נְדָבָה nedâbâh · voluntariness

Exodus

1. Exodus 35:29
   The children of Israel brought a willing offering unto the Lord, every man and woman, whose heart made them willing to bring for all manner of work, which the Lord had commanded to be made by the hand of Moses.
2. Exodus 36:3
   And they received of Moses all the offering, which the children of Israel had brought for the work of the service of the sanctuary, to make it withal. And they brought yet unto him free offerings every morning.