Albert Barnes Commentary Psalms 104:5

"Who laid the foundations of the earth, That it should not be moved for ever." — Psalms 104:5 (ASV)

Who laid the foundations of the earth - Referring still to the creation of the earth. The margin is, “He has founded the earth upon her bases.” The Hebrew word rendered in the margin “her bases” properly means a place, then a basis or foundation. The idea is that there was something, as it were, placed under the earth to support it. This idea is not uncommon in the Scriptures. Compare the notes at Job 38:4.

That it should not be removed for ever - So that it cannot be shaken out of its place. That is, it is fixed, permanent, and solid. Its foundations do not give way, as edifices built by man, but it remains the same from age to age—the most fixed and stable object of which we have any knowledge. Compare the notes at Psalm 78:69.