The cubit being nearly

Genesis 6:15
And this is how you are to build it: The ark is to be 300 cubits long, 50 cubits wide, and 30 cubits high.

two.

Genesis 7:2, 3, 8, 9, 15, 16
You are to take with you seven of every kind of clean animal, a male and its mate, and two of every kind of unclean animal, a male and its mate, . . .

Genesis 8:17
Bring out all the living creatures that are with you--birds, livestock, and everything that crawls upon the ground--so that they can spread out over the earth and be fruitful and multiply upon it."

Psalm 36:6
Your righteousness is like the highest mountains, Your judgments like the deepest sea. O LORD, You preserve man and beast.