Genesis 6:16-20

You shall make a window for the ark, and finish it to a cubit from the top; and put the door of the ark on the side; you shall make it with lower, second, and third decks.

Now behold, I Myself am bringing the flood of water upon the earth, to destroy all flesh in which there is the breath of life, from under heaven; everything that is on the earth shall perish.

But I will establish My covenant with you; and you shall enter the ark—you, your sons, your wife, and your sons’ wives with you.

And of every living thing of all flesh, you shall bring two of every kind into the ark, to keep them alive with you; they shall be male and female.

Of the birds according to their kind, and of the animals according to their kind, of every crawling thing of the ground according to its kind, two of every kind will come to you to keep them alive.