I'd like to see more tithing sermons taught on this passage:

And if the way is too long for you, so that you are not able to carry the tithe, when the LORD your God blesses you, because the place is too far from you, which the LORD your God chooses, to set his name there, then you shall turn it into money and bind up the money in your hand and go to the place that the LORD your God chooses and spend the money for whatever you desire—oxen or sheep or wine or strong drink, whatever your appetite craves. And you shall eat there before the LORD your God and rejoice, you and your household.
Deuteronomy 14:24-26