Exodus 35:5
'Give from among you a heave offering, unto the LORD. All that are willing in their hearts, shall bring heave offerings unto the LORD: gold, silver, brass:
Exodus 25:2-7
"Speak unto the children of Israel, that they give me a heave offering, and of every man that giveth it willingly with his heart, ye shall take it.
Judges 5:9
Mine heart loveth the maintainers of the law in Israel, that are willing among the people.
Psalm 110:3
In the day of thy power shall thy people offer thee free-will offerings with a holy worship; the dew of thy birth is of the womb of the morning.
Mark 12:41-44
And Jesus sat over against the treasury, and beheld how the people put money into the treasury. And many that were rich, cast in much.
2 Corinthians 8:11-12
Now therefore perform the deed, that as there was in you a readiness to will, even so ye may perform the deed, of that which ye have.
2 Corinthians 9:7
And let every man do according as he hath purposed in his heart, not grudgingly, or of necessity. For God loveth a cheerful giver.