Exodus 25:2
Speak to the children of Israel, that they bring me an offering: of every man that gives it willingly with his heart you shall take my offering.
Torrey's Topical Textbook—AKJV

2 Corinthians 8:12
For if there be first a willing mind, it is accepted according to that a man has, and not according to that he has not.
Torrey's Topical Textbook—AKJV