"Be sure your sin will find you out." Numbers 32:23
In Genesis we see man ruined.
In Exodus we see man redeemed.
In Leviticus we see man reverencing God.
In Numbers we see man rebelling against God.
The Promised Land of Canaan was a mere 11 days march from Egypt. However, because of the negative and discouraging reports brought back by 10 of the 12 scouts, and because the people of Israel chose to ignore the positive report brought back by 2 of the scouts, Joshua and Caleb, the Israelites grumbled and rebelled against God, and it actually took them 13,780 days.
Because of their disbelief and disobedience, God declared that, with the exception of the two faithful scouts, Joshua and Caleb, every one of that rebellious generation over 20 years old, would die before the nation of Israel would enter the Promised Land. A new generation was trained and disciplined in the wilderness to conquer the Promised Land, 40 years after the Exodus from Egypt.
"Now these things became our examples, to the intent that we should not lust after evil things as they also lusted." 1 Corinthians 10:6
Numbers provides many examples of how not to behave as the people of God. The 10 unfaithful scouts gave a negative report, which so discouraged the people that they wept aloud, grumbled against Moses and Aaron, and wanted to stone them to death. They declared that they would rather have died in Egypt! The people dismissed the exhortation of the faithful scouts, Joshua and Caleb, who said: "Let us go up at once and take possession, for we are well able to overcome it." Numbers 13:30. They wanted to go back to Egypt!