They've been preparing for years for tithing..... Malachi 3:10 (2013 edition) changed the wording from 'tenth parts" to "tithing". They may bring it out as new light and some idiots will say "Gee, I never remembered that being there!" (because it wasn't) Grrrrrrrrrrrr.
10 Bring the entire tithe* into the storehouse,+ so that there may be food in my house;+ and test me out, please, in this regard,” Jehovah of armies says, “to see whether I will not open to you the floodgates of the heavens+ and pour out* on you a blessing until there is nothing lacking.”+