Or HaChaim on Genesis 6:17/אור החיים על בראשית ו׳:י״ז

1 ואני הנני מביא את המבול. As far as I am concerned, here I shall bring on a deluge. It is difficult to justify the extra word ואני. Rashi explains it to mean: "I am prepared to concur with those angels who have considered man as not worth preserving." According to my own approach it simply means that the stage had been reached for G'd to give permission to the destructive agents which had readied themselves to carry out their design. Although the verse specifies only rain, the Zohar has elaborated on the meaning of the word מבול which would not have been needed had the Torah referred only to rain. This word alludes to the deadly power of the angel of death.