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Malachi 3: 8-9

8 Will man rob God? Yet you are robbing me. But you say, ‘How have we robbed you?’ In your tithes and contributions. 9 You are cursed with a curse, for you are robbing me, the whole nation of you.

“Many Christians “tip” God. By the way they live and use their finances, they say, ‘God, whatever is left over of my money, I’ll give to You. After I have spent my money on what I want, then I’ll give You something. After I have used my resources to build my business, You’ll get some of it during my retirement years.’” 

 Evans, Tony. Living in Financial Victory (The Kingdom Agenda) (p. 34-35). Moody Publishers