"On the last Yom Tov of Pesach, we read from Parshat Beshalach (-because it was on the seventh day of Pesach that they sang to Hashem [Az Yashir] at the Yam Suf- Rashi)"

(Gemara Megilah 31a)

"It says, '[Yehoshafat the king] appointed singers to Hashem... who went out in front of the army [that was on its way to fight back the attacking Moabites and Ammonites, at the word of Hashem], and they said, "Thank Hashem, for his kindness is eternal" ' (Divrei Hayamim II 20:21).

'Rav Yochanan said, 'Why doesn't it say "[Thank Hashem,] because this is good (Ki Tov), [for his kindness is eternal]" in this praise, [as it says when a similar praise is mentioned in Tehillim 106:1, 107:1, 118:1, and 136:1] ? Because Hashem isn't glad to see the destruction [even] of the wicked.'

'Rav Yochanan also said, 'Why does it say [about the night before the splitting of the sea] "They didn't approach each other all night"? It means to say that the angels, [about whom it is said "They call each other and sing praises" (Yeshayah 6:3)] wanted to sing the praises of Hashem, as usual, but Hashem stopped them, saying, "The works of my hands are drowning in the sea, and you want to sing to me!"

(Megilah 10b)

We can perhaps point out that the similarity goes far beyond the number of days alone. Just as the six days of the week formed the framework for the creation of the world at large, so too, the six Yomim Tovim represent the days which formed the framework for the creation of the nation of Yisroel, and with it, a new spiritual existence. In addition, each Yom Tov can be shown to closely parallel one of the days of creation, and the six Yomim Tovim listed above, in the order that they occur in the Jewish year, can be related to their respective days of the week (See Parasha-Page for Emor, 5755). For now, we will deal only with our subject, the second Yom Tov of Pesach, which is the counterpart of the second day of creation.

On the second day of creation it is stated, "Hashem said, let there be a heaven in the midst of the waters, and there will be a divider between waters and waters" (Breishit 1:6).

The first part of this Pasuk can be hinting to what happened on the seventh day of Pesach, when the heavens became revealed to the Bnai Yisroel as they stood in the midst of the waters of the Yam Suf (see Rashi Shmot 15:2). The following part can clearly be related to the divide that Hashem made for the Bnai Yisroel in the waters of the Yam Suf!

Rav Yochanan may be hinting that when Hashem's creations are destroyed, as was the case in Kriyat Yam Suf and the war of Yehoshafat, it isn't proper to say, "This is good!" (Ki Tov). Since the second day of creation corresponded to the second Yom Tov of Pesach, it carried with it the destiny of the Mitzri'im drowning in the Yam Suf. Therefore, that day wasn't branded with the comment "Ki Tov", as were the other days of creation!