'Freewill Offerings' in the Bible

beside the Sabbaths of the LORD, and beside your gifts, and all your vows, and all your freewill offerings which ye shall give unto the LORD.

These things ye shall do unto the LORD in your feasts: beside your vows and freewill offerings, in your burnt offerings, meat offerings, drink offerings and peace offerings."'

Thou mayest not eat within thy gates the tithe of thy corn, of thy wine and of thy oil, either the firstborn of thine oxen or of thy sheep, neither any of thy vows which thou vowest, nor thy freewill offerings or heave offerings of thine hands:

And Kore the son of Imnah the Levite, porter of the East door, had the oversight of the freewill offerings of God, to give heave offerings unto the LORD, and was over things most holy.

Afterward, the daily burnt offering also, and of the new moons and of all the feast days of the LORD that were hallowed, and all manner of freewill offerings, which they did of their own freewill unto the LORD.

Let the freewill offerings of my mouth please thee, O LORD, and teach me thy judgments.