God wanted Israel, as He wants Christians, to learn to utterly abhor and detest anything that had the potential of coming between them and their God. The believer's enemies are typically internal rather than external, and they pose a powerful threat to spiritual health and progress.
Max AndersMoses warned them [Israelites] that the leading spiritual danger they would face on entering the [promise] land would be forgetting the Lord. What adversity would not do, prosperity and satisfaction could. They were to be on their guard against spiritual lethargy.
Max Anders