Believer's should pay tithes of all their increase

And all the tithe of the land, whether of the seed of the land, or of the fruit of the tree, is the LORD’s: it is holy unto the LORD… the tenth shall be holy unto the LORD.  (Leviticus 27:30, 32).

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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)

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

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