'Statute 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.

As for the assembly, there shall be one [and the same] statute for you [of the congregation] and for the stranger who is a resident alien with you, a permanent statute throughout your generations; as you are, so shall the stranger be before the Lord.

And this is yours; the heave offering of their gift, with all the wave offerings of the children of Israel: I have given them unto you, and to your sons and to your daughters with you, by a statute forever: everyone that is clean in your house shall eat of it.

All the heave offerings of the holy things, which the children of Israel offer unto the LORD, have I given you, and your sons and your daughters with you, by a statute forever: it is a covenant of salt forever before the LORD unto you and to your descendants with you.

Only the Levites shall perform the service of the Tent of Meeting (tabernacle), and they shall bear their iniquity; it shall be a statute forever throughout your generations, that the Levites shall have no inheritance [of land] among the children of Israel.

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.