'Vain' in the Bible

Add not to bring in a vain present, Incense -- an abomination it is to Me, New moon, and sabbath, calling of convocation! Rendure not iniquity -- and a restraint!

Yea, Egyptians are vanity, and in vain do help, Therefore I have cried concerning this: 'Their strength is to sit still.'

Not in secret have I spoken, in a dark place of the earth, I have not said to the seed of Jacob, In vain seek ye Me, I am Jehovah, speaking righteousness, Declaring uprightness.

And I said, 'For a vain thing I laboured, For emptiness and vanity my power I consumed, But my judgment is with Jehovah, And my wage with my God.

They labour not for a vain thing, Nor do they bring forth for trouble, For the seed of the blessed of Jehovah are they, And their offspring with them.