“And behold! Hashem was standing over him.” .On this verse the Medrash (Bereishis Rabba 69a) cites the verses (Tehillim 63:2-3): “`My soul thirsts for You, my flesh longs for You, in a parched and thirsty land with no water. Thus to have beheld You in the Kodesh (Sanctuary), to see Your might and Your glory.’—Just as my soul is thirsty for You, so are my 248 limbs thirsty for You…`Thus to have beheld You in the Kodesh’—therefore with kedushah I beheld You.”
It seems that this verse is coming to reconcile a certain difficulty. In his dream, Yaakov Ovinu saw HaKodosh Boruch Hu’s promise to Yaakov and his descendants to inherit Eretz Yisroel. Likewise Hashem showed Yaakov the revelation on Mount Sinai, the building of the Beis HaMikdosh and the korbonos. But why was all this revealed to Yaakov Ovinu in a dream and not through a prophecy? A dream is the lowest form of nevu’ah(prophecy). The Zohar HaKodesh (I, 149a) writes that a dream is only the sixth level of prophecy, and the gemora (Berochos 57a) writes that a dream is a mere sixtieth of prophecy.
Although a nevu’ah is a more elevated level than a dream, Hashem wanted to demonstrate Yaakov Ovinu’s enormous kedushah. Not only was Yaakov’s neshomoh full of kedushah, also his body, and primarily his body, was sanctified. Chazal allude to this when they write, “Just as my soul is thirsty for You, so are my 248 limbs thirsty for You.” Chazal emphasize that since the 248 limbs of Yaakov’s body were thirsty for Hashem he merited seeing this vision in a dream. At night a person’s neshomoh ascends to Heaven and leaves the body by itself, shows to what degree his body had become sanctified.
“Thus to have beheld You in the Kodesh (Sanctuary)”—therefore I (Yaakov) have beheld You with my body’s kedushah. Yaakov Ovinu himself became kodesh because he sanctified his body and for that reason merited the marvelous vision shown to him in a dream.
Maran Rebbe Yissochor Dov of Belz zy’a