'Perpetual' in the Bible

Thus says the Lord Yahweh: Because the Philistines have dealt by revenge, and have taken vengeance with despite of soul to destroy with perpetual enmity;

Because you have had a perpetual enmity, and have given over the children of Israel to the power of the sword in the time of their calamity, in the time of the iniquity of the end;

I will make you a perpetual desolation, and your cities shall not be inhabited; and you shall know that I am Yahweh.

You shall prepare a meal offering with it morning by morning, the sixth part of an ephah, and the third part of a hin of oil, to moisten the fine flour; a meal offering to Yahweh continually by a perpetual ordinance.