'Freewill Offering' in the Bible

and all the silver and the gold, which thou shalt find, in all the province of Babylon, - with the freewill offering of the people and of the priests offered willingly for the house of their God which is in Jerusalem,

Then said I unto them, Ye, are hallowed unto Yahweh, and, the utensils, are hallowed, - and, the silver and the gold, are a freewill offering, unto Yahweh, God of your fathers: