Let's go with a summary from the past several weeks before going further. Leaving Egypt and crossing the Red Sea is a shadow of being born-again and water-baptized. The wilderness is renewing the mind: thoughts, emotions, and will. And entering the promised land is entering the kingdom of God, which is the righteousness of God in Christ Jesus, the peace of God beyond understanding, and the joy of the Lord, which is our strength to overcome the giants of sin in our life. Heaven and eternal life are waiting for the overcomer by the blood of the lamb, our testimony in the faithfulness of God, and loving not our life unto death but losing it for Christ's sake.
Heaven will not be Heaven if the flesh goes with us. The flesh will not inherit the kingdom of God. Iniquity would take over if we could take our choice of sin into the promised land. Let's look at a few case studies from scripture that were recorded for us in the New Covenant to glean from.
The first case is where eight people were saved from the destruction of a world where every thought was fused with violence. Noah was considered a righteous preacher. However, as soon as the Ark takes dock, Noah carries out the longest premeditated sin. After giving sacrifices to God, Noah plants a vineyard, gets drunk in his tent, and is naked. I'm unsure why the Bible details the nakedness, but it has something to do with Noah's son Ham. Both bring the old world into the new world.
The second case of leaving the flesh behind before entering the promised land is the story of Abraham and Lot. Abraham interceded to have Lot and his family delivered from Sodom & Gomora to restart the cities from within a cave. Lot and his two daughters escaped the destruction of four cities just to start the cities over with incest. Lot's daughters knew that God once destroyed the world with water to cleanse it for a new beginning. And Lot's daughters knew that God would destroy the world again with a more potent cleansing agent of fire. Maybe Lot's daughters thought the world was destroyed, and it was up to them to repopulate the new world. Whatever they were thinking, they birthed a new Sodom and Gomorrah. But that is what sin does to us: it causes us to think too highly of ourselves.