'Vain' in the Bible

Bring no more vain oblations; incense is an abomination unto me; new moon and sabbath, the calling of assemblies,- I cannot away with iniquity and the solemn meeting.

For Egypt helpeth in vain, and to no purpose: therefore have I called her Rahab that sitteth still.

I say, thy counsel and strength for the war are but vain words: now on whom dost thou trust, that thou hast rebelled against me?

I have not spoken in secret, in a place of the land of darkness; I said not unto the seed of Jacob, Seek ye me in vain: I, Jehovah, speak righteousness, I declare things that are right.

But I said, I have labored in vain, I have spent my strength for nought and vanity; yet surely the justice due to me is with Jehovah, and my recompense with my God.

Thou wast wearied with the length of thy way; yet saidst thou not, It is in vain: thou didst find a quickening of thy strength; therefore thou wast not faint.

They shall not labor in vain, nor bring forth for calamity; for they are the seed of the blessed of Jehovah, and their offspring with them.