Adam Clarke on Psalms 49:8

For the redemption of their soul is precious - It is of too high a price to be redeemed with corruptible things, such as silver or gold, and has required the sacrificial death of Christ.

And it ceaseth for ever - This is very obscure, and may apply to the ransom which riches could produce. That ransom must be for ever unavailable, because of the value of the soul. Or this clause should be added to the following verse, and read thus: "And though he cease to be, (וחדל vechadal), during the hidden time, (לעולם leolam); yet he shall live on through eternity, (ויחי עוד לנצח vichi od lanetsach), and not see corruption." This is probably the dark saying which it was the design of the author to utter in a parable, and leave it to the ingenuity of posterity to find it out. The verb חדל chadal signifies a cessation of being or action, and עולם olam often signifies hidden time, that which is not defined, and the end of which is not ascertained, though it is frequently used to express endless duration. This translation requires no alteration of the original text, and conveys a precise and consistent meaning.