"The people rejoiced over the offerings, for they had given freely and wholeheartedly to the Lord, and King David was filled with joy." - 1 Chronicles 29:9
Israelites were required a tithe (usually a tenth) of their yearly wage, another for a holy festival, and another every three years...but Jesus emphasized that it must also be accompanied by a spirit of generosity. What maybe should be our driving force is not so much what we should give, but what should we keep?
GO DEEPER: Malachi 3:6-12