From New World Encyclopedia
Unification Aspects:

In the ''Divine Principle'', the Israelites' attitude toward the gift of manna play a key role in the failure of the second stage of the Exodus, leading ultimate to the failure of Moses' "second 40-year course" and its prolongation to become 40 years in the wilderness. After Moses led the Israelites out of Egypt, they were supposed to unite strongly with him based on the words of the Ten Commandment's and centering externally on the Tabernacle. If they had done so, they would have marched quickly through the wilderness to Canaan rather than remaining there for 40 years.

The Israelites received three opportunities to demonstrate their unity. The first opportunity ended in failure due to the incident of the Golden Calf while Moses was absent on Mount Sinai. However, after the Israelites repented, God gave them a second chance. They indeed united in faith with Moses and Aaron and successfully built the Tabernacle as the external symbol of God's presence among them. They were sustained during this time by God's gift of manna. Originally this situation was only supposed to last long enough for them to travel through the wilderness of Sinai and enter Canaan, a matter not of years or even months, but weeks. However, when the Israelites complained about their diet and wished to go back to Egypt where their could eat better, Satan spiritually invaded the foundation of faith they had established centered on the Tabernacle.

The Israelites set out from the wilderness of Sinai, arrayed in formation around the Tabernacle and led by the pillar of cloud. (Num. 10:11-12) Yet before long, they began to complain about their hardships and murmur against Moses…. They continued to complain, lamenting that they had nothing to eat but manna. They were resentful toward Moses and longed for the meat, fruit, vegetables and luxuries of Egypt. (Num. 11:1-6) Thus, the Israelites failed to maintain the second foundation for the Tabernacle, and it was invaded by Satan. The providence to restore this foundation was prolonged to a third attempt. [1]

The Israelite's third chance came through the period 40 days of spying on Canaan. When this, too, ended in failure, the first generation of Israelites' who left Egypt sealed their fate to perish in the wilderness. Moses' course was thus extended another 40 years, one year for every day of the spying. The older generation of the Exodus died in the wilderness, while only Joshua, Caleb and the younger generation born outside of Egypt would survive to enter the promised land. However, God continued to provided manna for them and their parents throughout their course of wandering in the wilderness.

The Principle follows the Christian tradition that manna represented the body of the Messiah. However, the Divine Principle does not hold to the Christian doctrine that Jesus of Nazareth was predestined to be the Messiah. Indeed, Divine Principle teaches that the Messiah could have come at any one of several stages after the Israelites entered Canaan, and would have been someone other than Jesus if this had occurred.
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