What do we learn from "b'Chezvi Im Leilya"?
Ibn Ezra: It was a vision of the night.
Malbim: When he saw the dream, he saw also that it is night. Sometimes it seems to a dreamer that it is day. Night shows that this is a Nevu'ah about the great night ? Galus.
What is the meaning of "va'Aru"?
Rashi: Behold.
Ibn Ezra: This is like v'Elu (and these). Some say that [also elsewhere, Lamed switches with Reish -] this is like "[va'Yeda] Almenosav" ? Armenosav (its castles).
What were the four Ruchos doing?
Rashi: They blew from the four directions and fought Yam ha'Gadol, and made it stormy. Malbim ? each of the four kingdoms pertains to a different direction, like I explained in Zecharyah. All four kingdoms always exist, just at any time, one of them overpowers; the other kingdoms and Ruchos are included in it. He saw the world in the form of Yam ha'Gadol, for storm winds are recognized more at sea. Sea creatures are bigger than land creatures. It is as if each storms at night to overpower and seize power.
Ibn Ezra (2, 14): Magichan is like "Yagi'ach Yarden" (moving it from its place). He saw the four Ruchos, for the four kingdoms were in different corners of the world. Why did he see them perturbing Yam ha'Gadol? All the kingdoms were on the dry land! Perhaps sea creatures are bigger than land creatures.


