Gen 6:19 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. Gen 7:15 And they went in unto Noah into the ark, two and two of all flesh, wherein is the breath of life. 16 And they that went in, went in male and female of all flesh, as God had commanded him: and the LORD shut him in.