Genesis 27:28-29
28. God give thee of the dew of heaven—To an Oriental mind, this phraseology implied the highest flow of prosperity. The copious fall of dew is indispensable to the fruitfulness of lands, which would be otherwise arid and sterile through the violent heat; and it abounds most in hilly regions, such as Canaan, hence called the "fat land" (Ne 9:25, 35).
plenty of corn and wine—Palestine was famous for vineyards, and it produced varieties of corn, namely, wheat, barley, oats, and rye.29. Let people serve thee—fulfilled in the discomfiture of the hostile tribes that opposed the Israelites in the wilderness; and in the pre-eminence and power they attained after their national establishment in the promised land. This blessing was not realized to Jacob, but to his descendants; and the temporal blessings promised were but a shadow of those spiritual ones, which formed the grand distinction of Jacob's posterity.
Genesis 28:13-15
13. The Lord stood above it, and said—That Jacob might be at no loss to know the purport of the vision, he heard the divine voice; and the announcement of His name, together with a renewal of the covenant, and an assurance of personal protection, produced at once the most solemnizing and inspiriting effect on his mind.