'Freewill Offering' in the Bible

In any place where a survivor (Jewish exile) may live, let the men (Gentiles) of that place support him with silver and gold, with goods and cattle, together with freewill offerings for the house of God in Jerusalem.’”

Some of the heads of the fathers’ households (extended families), when they arrived at the house of the Lord in Jerusalem, made voluntary contributions for the house of God to rebuild it on its [old] foundation.

and afterward, there was the continual burnt offering, the offering at the New Moons, and at all the appointed festivals of the Lord that were consecrated, and the offerings of everyone who made a voluntary offering to the Lord.

and all the silver and gold which you find in the whole province of Babylon, along with the freewill offering of the people and of the priests for the house of their God in Jerusalem.

Then I said to them, “You are holy to the Lord, the utensils are holy, and the silver and the gold are a freewill offering to the Lord God of your fathers.