Thematic Bible: Obligatory when signified in a vow
Thematic Bible
Offerings » Free-will » Obligatory when signified in a vow
Then observe the Festival of Weeks in the presence of the LORD your God by giving your tribute and the freewill offering of your hands in proportion to the manner in which the LORD your God blessed you.
Be sure you do whatever you promise, because you have given your word voluntarily to the LORD your God.