This weeks portion

[voter x]

goes into detail how Hashem warns of the turning away from him.

"6. Lest you become corrupt and make for yourselves a graven image, the representation of any form, the likeness of male or female, 17. the likeness of any beast that is on the earth, the likeness of any winged bird that flies in the heaven, 18. the likeness of anything that crawls on the ground, the likeness of any fish that is in the waters, beneath the earth.
19. And lest you lift up your eyes to heaven, and see the sun, and the moon, and the stars, all the host of heaven, which the Lord your God assigned to all peoples under the entire heaven, and be drawn away to prostrate yourselves before them and worship them.
20. But the Lord took you and brought you out of the iron crucible, out of Egypt, to be a people of His possession, as of this day.
21. And the Lord was angry with me because of you, and He swore that I would not cross the Jordan and that I would not come into the good land the Lord, your God, is giving you as an inheritance.
22. For I will die in this land; I will not cross the Jordan. You, however, will cross, and you will possess this good land.
23. Beware, lest you forget the covenant of the Lord your God, which He made with you, and make for yourselves a graven image, the likeness of anything, which the Lord your God has forbidden you.
24. For the Lord your God is a consuming fire, a zealous God.
25. When you beget children and children's children, and you will be long established in the land, and you become corrupt and make a graven image, the likeness of anything, and do evil in the eyes of the Lord your God, to provoke Him to anger,
26. I call as witness against you this very day the heaven and the earth, that you will speedily and utterly perish from the land to which you cross the Jordan, to possess; you will not prolong your days upon it, but will be utterly destroyed. 27. And the Lord will scatter you among the peoples, and you will remain few in number among the nations to where the Lord will lead you.
28. And there you will worship gods, man's handiwork, wood and stone, which neither see, hear, eat, nor smell. 29. And from there you will seek the Lord your God, and you will find Him, if you seek Him with all your heart and with all your soul. 30. When you are distressed, and all these things happen upon you in the end of days, then you will return to the Lord your God and obey Him."

the complete portion here
http://www.chabad.org/parshah/rashi/default.asp?AID=36233