'Eternal' in the Bible

For if the order which was for a time had its glory, much more will the eternal order have its glory.

While our minds are not on the things which are seen, but on the things which are not seen: for the things which are seen are for a time; but the things which are not seen are eternal.

For we are conscious that if this our tent of flesh is taken down, we have a building from God, a house not made with hands, eternal, in heaven.