The key difference for us is we are not in the Mosaic Covenant; we are in the New Covenant inaugurated in Jesus (see 1 Cor. 11:25). In the Mosaic Covenant, God blessed Israel as a result of obedience. In the New Covenant, we need to think about material blessing differently. God is certainly able and may choose to give material blessings – but He is not obligated nor has He promised to always act in this way towards us. We can't expect to give $10 and receive a $100 in return. He informs us in 2 Cor. 9:6-11 of how we should think of material blessing. Of particular importance for us today is v.11, as God says, "You will be made rich in every way so that you can be generous on every occasion, and through us your generosity will result in thanksgiving to God." One person commented on this verse saying, "Paul is not advocating giving that will result in blessing but rather blessing that will result in giving." In the New Covenant, we will not be material blessed because of obedience (like in Malachi 3 and the Mosaic Covenant); we will be material blessed in order to be generous. And our giving will bring thanksgiving and praise to God (v.11).