'Eternal' in the Bible

""Meanwhile, as for me, I'll remember my covenant with you from when you were young, because I'll establish an eternal covenant with you.

And I will make an agreement of peace with them: it will be an eternal agreement with them: and I will have mercy on them and make their numbers great, and will put my holy place among them for ever.

And you are to give, morning by morning, a meal offering with it, a sixth of an ephah and a third of a hin of oil dropped on the best meal; a meal offering offered to the Lord at all times by an eternal order.