Malachi 3:8-10
Will a man rob God with their tithes and offering?
Bring the whole tithe into the storehouse. Test me in this says the Lord Almighty, and see if I will not open the window of heaven and pour out a Blessing that there will not be room enough to store it.
2 Corinthians 9:7
So let him give, not grudgingly or of necessity; for God loveth a cheerful giver.
Luke 6:38
Give, and it will be given to you. A good measure, pressed down, shaken together and running over shall men give into your bosom. For with the measure you use, it will be measured to you.