Arcana Coelestia #779
779. And they went in unto Noah into the ark. That this signifies that they were saved, has been already shown. That “two and two” signify pairs, and what they are, may be seen at Genesis 6:19.
Genesis 6:19
19
Of every living thing of all flesh, you shall bring two of every sort into the ship, to keep them alive with you. They shall be male and female.