Musar for Sanhedrin 215:14
(ואף על נח נחתם גזר דין שנא' ולא נח בהם) תנא דבי ר' ישמעאל אף על נח נחתך גזר דין אלא שמצא חן בעיני ה' שנאמר (בראשית ו, ז) נחמתי כי עשיתם ונח מצא חן בעיני ה'
R. Johanan said: The corruption of the generation of the Flood is characterised as great, and their punishment is characterised as <i>great</i>. Their corruption is characterised as great, as it is written, <i>And God saw that the wickedness of man, was</i> great<i> in the earth;</i><span class="x" onmousemove="('comment',' Ibid. VI, 5. ');"><sup>27</sup></span> and their punishment is characterised as great, as it is written, <i>All the fountains of the great deep.</i> R. Johanan said: Three of those [hot fountains] were left,<span class="x" onmousemove="('comment',' It is stated further on that hot water gushed forth from these fountains. Only three such fountains remained after the flood. ');"><sup>28</sup></span>