Tithing Question(s)

Hello Friends,

I have a question that's been on my mind and been brought up in conversation a lot lately. Where does it say in the Bible to tithe 10%? Where did this come from?

What are your thoughts on tithing? Should money go directly to whatever church you are attending? or Can the money be designated by God to go to some other cause, charity, etc.?

I'm very interested on people's thoughts on this one and if anyone can answer my previous questions.

<3 Anna

Ps. Don't know how accurate this is, but just found this on Wikipedia (I know not the most reliable source)

"A tithe (pronounced /ˈtaɪð/; from Old English teogoþa "tenth") is a one-tenth part of something, paid as a (usually) voluntary contribution or as a tax or levy, usually to support a religious organization. Today, tithes (or tithing) are normally voluntary and paid in cash, cheques, or stocks, whereas historically tithes were required to be paid in kind, such as agricultural products (that grown of the land, or fruit of the tree). Several European countries operate a formal process linked to the tax system allowing some churches to assess tithes."