The Rabbi B'chai writes : Why did not Noah pray that the
world should not be destroyed; as we find of Abraham, as
soon as God told him about the coming destruction of Sodom
and Gomorrah, he prayed several times on behalf of the
wicked ; and as also did the prophets ? (Reply) Noah having
seen that there were not ten righteous in his generation, could
not pray on their behalf that they should be spared alive, as
also Abraham, in the case of Sodom and Gomorrah, could not
pray for less than ten righteous. Another explanation why
Noah did not pray on their behalf is : because God warned
them 120 years that they should be godly, and they took no
heed.
15 And thus thou shalt make it. God ordered the length
of the ark to be 300 cubits, the breadth of it 50 cubits, and
the height of it 30 cubits ; and a window to admit light.
There were in the ark three storeys, one over the other ; the
uppermost storey was for man, the second for cattle and beasts
and fowls j and the lower for dung.
18 And with thee will I establish my covenant. God said
unto Noah, " I will keep my oath with thee, that the fruit and
the com shall not rot in the ark, and that the wicked should
not slay thee on account of the ark, and that thou with thy
children with the women shall enter into the ark." * * *

19 A7id of every living tiling of all flesh, two of every sort.
