Genesis 6

13 God said to Noah, "I will bring an end to all flesh, for the earth is filled with violence through them. Behold, I will destroy them and the earth. 14 Make a ship of gopher wood. You shall make rooms in the ship, and shall seal it inside and outside with pitch. 15 This is how you shall make it. The length of the ship shall be three hundred cubits,*6:15 A cubit is the length from the tip of the middle finger to the elbow on a man’s arm, or about 18 inches or 46 centimeters. its width fifty cubits, and its height thirty cubits. 16 You shall make a roof in the ship, and you shall finish it to a cubit upward. You shall set the door of the ship in its side. You shall make it with lower, second, and third levels.