These are all arguments that I believe deserve serious consideration, though I think they all fall short of convincing. This list will be a count down, with the last one (1) being the strongest argument.
(6) Argument from the Mosaic law: Since Deuteronomy 16:17 commands proportional giving, and Paul is referencing Deuteronomy 16:17 in 1 Corinthians 16:2, tithing, the prescribed proportion, is still binding.
(5) The Argument from Hebrews: Hebrews 7 proves that Christians should tithe. Since tithes were due to Melchizedek, and Jesus is in the line of Melchizedek, tithes are now due to Jesus.
(4) The Argument from Jesus’ Teaching: Matthew 23:23 should be understood as Jesus commanding Christians to tithe. Rather than referring to Matthew 23:23 as a command, some use commend, endorse, approve, or sanction. Furthermore, if Jesus wanted to abrogate the law, this was the perfect time to do that.
(3) Moral Law Argument: The Mosaic Law has three parts: Civil Law, Ceremonial Law, and Moral Law. The first two have been abolished by Christ. Tithing is a part of the moral law and therefore continues. One way this is done is through the fact that tithing existed before the ceremonial law so it can not be “typical.”
(2) Paul commended tithing conceptually: Though Paul never mentioned tithing explicitly, the concept is present in his epistles. While 1 Corinthians 16:2 is sometimes used, 1 Corinthians 9:13 remains the strongest verse in arguing for the continuation of tithing.
(1) The Argument from Natural Law: Since tithing was practiced before the Mosaic Law and by all nations in the history of the world, it is a part of natural law or is a universal law (typically based upon its ancient practice). The only reasonable explanation for the consistent use of “10%” must be that God commanded it very early, if not in the Garden.
In total, 20 arguments have been presented. They have been listed in order from weakest to strongest. Does anyone know of a "better" argument for tithing ... besides the cartoon below!