When we give freely to God, we receive freely from God.

Give, and it will be given to you. A good measure, pressed down, shaken together, and running over, will be poured into your lap. For with the measure you use, it will be measured to you. (Luke 6:38, NIV)

One man gives freely, yet gains even more; another withholds unduly but comes to poverty. (Proverbs 11:24, NIV)

God promises to bless us over and above what we give and also according to the measure that we use to give. But, if we hold back from giving with a stingy heart, we hinder God from blessing our lives.