'Willingly' in the Bible

All those who were around them strengthened their hands with vessels of silver, with gold, with goods, and with animals, and with precious things, besides all that was willingly offered.

Some of the heads of fathers' [houses], when they came to the house of Yahweh which is in Jerusalem, offered willingly for the house of God to set it up in its place:

and afterward the continual burnt offering, and [the offerings] of the new moons, and of all the set feasts of Yahweh that were consecrated, and of everyone who willingly offered a freewill offering to Yahweh.

and all the silver and gold that you shall find in all the province of Babylon, with the freewill offering of the people, and of the priests, offering willingly for the house of their God which is in Jerusalem;