Giving to the One who gave us all, is a personal and felthearted decision that goes along with our worship. When we participate and minister to the body of Christ financially, and without grief, willfully and cheerfully, we give to the LORD. God is then well pleased and this is acceptable in His sight. We do not give to obligate God like in a trade-deal, but because He loves us. And because He is a good Father, He freely and graciously rewards us with increase in our barns and lives. 
Thus so: 2 Corinthians 9:7 (KJV) says ” Every man according as he purposeth in his heart, so let him give; not grudgingly, or of necessity: for God loveth a cheerful giver.”