Indy tells the G-men that Moses received the Ten Commandments on Mt. Ararat when he opens the book near the beginning of the film. Mt. Ararat is the supposed resting place of Noah's Ark, not the Ark of the Covenant. He should have said Mt. Sinai.
I must recant this entry - I watched the movie again with the subtitles on and Indy says Mt Herub, not Ararat, so I was wrong and apologize. Don't hate me (c: