Adam Clarke's Commentary on the Bible

Verse 25 (Psalms 102:25)

Of old hast thou laid the foundation - None taught of God ever imagined the world to have been eternal. Of old, לפנים lephanim , before there were any faces or appearances, thou didst lay the foundations of the earth. It was created by thee; it did not grow by accretion or aggregation from a pre-existent nucleus. There was nothing; and thou didst produce being - substance or matter. Out of that created matter thou didst make the earth and the heavens.

- Adam Clarke's Commentary on the Bible