'Voluntary offerings' in the Bible

"You won't be allowed to eat your tithe of grain, new wine, oil, the firstborn of your herd and flock, your voluntary offerings that you pledged, your free-will offerings, and the works of your hands in your own cities.

So the leaders of the ancestral households presented their voluntary offerings, as did the leaders of the tribes, the commanders of thousands and hundreds, and the officials in charge of the king's business.

But who am I, and who are my people, that we make such voluntary offerings as these? For all things come from you, and from your own hand we are giving to you.

Imnah the descendant of Levi's son Kore, keeper of the eastern gate, was in charge of voluntary offerings to God, apportioning contributions for the LORD and the most holy things.

Furthermore, everyone who wishes to repatriate from any territory where he now resides is to receive assistance from his fellow residents in the form of silver, gold, equipment, and pack animals, in addition to voluntary offerings for the Temple of the God of Jerusalem.

So all of their neighbors equipped the travelers with silver, gold, equipment, pack animals, and valuable goods, in addition to voluntary offerings.

After that, they offered all of the continual burnt offerings and the New Moon sacrifices for all of the designated festivals of the LORD that were being consecrated, along with all the voluntary offerings that were dedicated to the LORD.

LORD, please accept my voluntary offerings of praise, and teach me your judgments.