Genesis 8:17

Bring forth with thee every living thing that is with thee, of all flesh, both of fowl and of cattle and of every creeping thing that creepeth upon the earth, that they may breed abundantly in the earth, and be fruitful, and multiply upon the earth. The animals that had been in the ark with Noah, all the birds and the mammals and the reptiles, were to be the nucleus for, the parent-stock of, a new world of animals. For that reason the Lord even intensified the blessing which He had spoken upon them after their creation, Genesis 1:22 ff. The new generation was to be propagated mightily and grow into very many as soon as possible, for the whole earth was now without living inhabitants with the exception of those saved in the ark.