'Forever' in the Bible

"The sons of Aaron, the priests, shall blow the trumpets. This shall be to you for a statute forever throughout your generations.

For the assembly, there shall be one statute for you, and for the stranger who lives as a foreigner [with you], a statute forever throughout your generations: as you are, so shall the foreigner be before Yahweh.

Yahweh spoke to Aaron, "I, behold, I have given you the command of my wave offerings, even all the holy things of the children of Israel; to you have I given them by reason of the anointing, and to your sons, as a portion forever.

"This is yours, too: the wave offering of their gift, even all the wave offerings of the children of Israel. I have given them to you, and to your sons and to your daughters with you, as a portion forever. Everyone who is clean in your house shall eat of it.

All the wave offerings of the holy things, which the children of Israel offer to Yahweh, have I given you, and your sons and your daughters with you, as a portion forever: it is a covenant of salt forever before Yahweh to you and to your seed with you."

But the Levites shall do the service of the Tent of Meeting, and they shall bear their iniquity: it shall be a statute forever throughout your generations; and among the children of Israel they shall have no inheritance.

He who gathers the ashes of the heifer shall wash his clothes, and be unclean until the evening: and it shall be to the children of Israel, and to the stranger who lives as a foreigner among them, for a statute forever.