First and foremost, God wants us to give because it shows that we recognize he is truly the Lord of our lives.
Everything we own and everything we have comes from God. So, when we give, we simply offer him a very small portion of all the abundance he has already given to us. Giving is an expression of our thankfulness and praise to God. It comes from a heart of worship that recognizes that everything we give already belongs to him. God instructed Old Testament believers to give a tithe, or a tenth, because this 10% represented the first, or most important portion of all that they had. The New Testament does not suggest a certain percentage for giving, but simply says for each to give “in keeping with his income.” Believers should give according to their income.