God wrote the Ten Commandments with His own finger, on tablets of Stone, in Hebrew.
When He had finished speaking with him upon Mount Sinai, He gave Moses the two tablets of the testimony, tablets of stone, written by the finger of God. -Exodus 31:18
He also frequently spoke to His people in Hebrew. And of course, we now have Hebrew records of all of these divine words.
My question is: Why Hebrew? (I am assuming this is not because God speaks Hebrew in Heaven...)
Is it because Hebrew was the ideal language for communicating the truths of the Old Testament?
Is it simply because His people happened to speak that language?
Are there any Old Testament passages which show God speaking (or writing) in a different language?
I would also love it if you could include a comment about whether this teaches us anything about the nature of God. Thanks.

This question does not show any research effortI think is probably the reason it's getting down votes. The fact that the accepted answer begins with "Here's the obvious answer" would lend weight to this theory. – Flimzy Jul 9 '12 at 3:58