'Perpetually' in the Bible

This is the oblation of Aaron and of his sons, which they shall offer unto Jehovah in the day when he is anointed: the tenth part of an ephah of fine flour for a meal-offering perpetually, half of it in the morning, and half thereof in the evening.

The Lord commanded this to be given to the priests by the Israelites on the day that He anointed them. It is their portion perpetually throughout their generations.’”

The thigh offered by lifting up and the breast offered by waving they shall bring along with the offerings by fire of the portions of fat, to present as a wave offering before the Lord; so it shall be a thing perpetually due you and your sons with you, just as the Lord has commanded.”

Nevertheless, the cities that belong to the descendants of Levi that is, the houses in the cities that belong to them are to belong to the descendants of Levi perpetually as part of their right of redemption.

You may give them as inheritance to your children after you to possess as property. You may enslave them perpetually. However, as for your brothers the Israelites, no man may rule over his brother harshly.