'Lasting' in the Bible

Yet I will remember the covenant I made with you in the days of your youth, and I will establish a lasting covenant with you.

"?"And the inhabitants of the towns of Israel will go out, and they will set ablaze, and they will kindle a fire with a weapon and a small shield and a shield, [with] a bow and with arrows, and with {hand clubs} and with spears, and [so] they will light a fire with them, {a fire lasting seven years}.

In the first [month], on the {fourteenth} day of the month, you shall have the Passover, feast [lasting for] {seven days}, [when] you shall eat unleavened breads.