Tithing
There is nothing complicated or fancy about tithing. God asks us for a tenth of what we receive. Where it gets complicated is in our attitudes towards God. In the Old Testament, God condemns Israel for not bringing their tithes as they should, accusing them of robbing Him of what is His (Malachi 3:8-12). But yet in the New Testament, Jesus confronts the Pharisees for their legalism in tithing (Luke 11:42). This apparent contradiction says to me that the issue isn’t so much one of tithing, but one of heart and attitude.