Moses 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 AndersGod warned Israel, "And if thou wilt make me an altar of stone, thou shalt not build it of hewn stone: for if thou lift up thy tool upon it, thou hast polluted it" (Ex. 20:25). To pollute something is to make it ordinary. God insists that any approach crafted by human ingenuity will produce a worship system just like all the pagan systems in the world. In other words, it will be common or profane - just like everyone else's paganism.
Max Anders