Genesis 6:19

And you will take with you into the ark two of every sort of living thing, and keep them safe with you; they will be male and female.

Genesis 7:2-3

Of every clean beast you will take seven males and seven females, and of the beasts which are not clean, two, the male and his female;

Genesis 7:8-9

Of clean beasts, and of beasts which are not clean, and of birds, and of everything which goes on the earth,

Genesis 7:15-16

They went with Noah into the ark, two and two of all flesh in which is the breath of life.

Genesis 8:17

Take out with you every living thing which is with you, birds and cattle and everything which goes on the earth, so that they may have offspring and be fertile and be increased on the earth.

Psalm 36:6

Your righteousness is like the mountains of God; your judging is like the great deep; O Lord, you give life to man and beast.

Treasury of Scripture Knowledge

Summary

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

Bible References

Two

Genesis 7:2
Of every clean beast you will take seven males and seven females, and of the beasts which are not clean, two, the male and his female;
Genesis 8:17
Take out with you every living thing which is with you, birds and cattle and everything which goes on the earth, so that they may have offspring and be fertile and be increased on the earth.
Psalm 36:6
Your righteousness is like the mountains of God; your judging is like the great deep; O Lord, you give life to man and beast.

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain