Helamn 7

 A Nephi warns the people of Nephi in the quick turn to iniquity, he says - 

O, how could you have forgotten your God in the very day that he has delivered you?

21 But behold, it is to get gain, to be praised of men, yea, and that ye might get gold and silver. And ye have set your hearts upon the riches and the vain things of this world, for the which ye do murder, and plunder, and steal, and bear false witness against your neighbor, and do all manner of iniquity.

22 And for this cause wo shall come unto you except ye shall repent. For if ye will not repent, behold, this great city, and also all those great cities which are round about, which are in the land of our possession, shall be taken away that ye shall have no place in them; for behold, the Lord will not grant unto you strength, as he has hitherto done, to withstand against your enemies."  (Helaman 7:20–22)

Again, a great warning to us in our day.