Who said a fool and his money are soon parted?

It is most often attributed to P.T. Barnum; but was probably around long before he quoted it.

Another answer:

The quote "A fool and his money are soon parted" is a non biblical proverb from an intructional poem titled "Five Hundred Points of Good Husbandry " which was written by Thomas Tusser (1524-1580), an English poet and farmer.