'Perpetually' in the Bible

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.’”

They shall bring the thigh presented by lifting up and the breast presented by waving, along with the offerings by fire of the fat, to present as a wave offering before the Lord. This shall be yours and your sons’ with you, as your perpetual portion, just as the Lord has commanded.”