Bible Verses About Vanity: Idolatry is

And they rejected his ordinances, and the covenant that he made with their fathers, and the testimonies which he testified against them: and they followed vanities, and acted vainly: and they followed the nations that were round about them, concerning which the Lord had commanded them that they should not do as they did.

For this shall every one that is holy pray to thee in a seasonable time. And yet in a flood of many waters, they shall not come nigh unto him.

The makers of idols are all of them nothing, and their best beloved things shall not profit them. They are their witnesses, that they do not see, nor understand, that they may be ashamed.

Who hath formed a god, and made a graven thing that is profitable for nothing?

They shall be all proved together to be senseless and foolish: the doctrine of their vanity is wood.

Because my people have forgotten me, sacrificing in vain, and stumbling in their ways, in ancient paths, to walk by them in a way not trodden: