Genesis 6:14-16

Make for yourself an ark of gopher wood; make rooms in the ark and coat it with pitch inside and out.

And this is how you are to build it: The ark is to be 300 cubits long, 50 cubits wide, and 30 cubits high.

You are to make a roof for the ark, finish its walls a cubit from the top, place a door in the side of the ark, and build lower, middle, and upper decks.