Genesis 6:14-16

¹⁴Make for yourself an ark of gopher wood; you shall make the ark with rooms, and shall cover it inside and out with pitch. ¹⁵This is how you shall make it: the length of the ark three hundred cubits, its breadth fifty cubits, and its height thirty cubits. ¹⁶You shall make a window for the ark, and finish it to a cubit from the top; and set the door of the ark in the side of it; you shall make it with lower, second, and third decks.