'Solid' in the Bible

"Come, go to this steward, to Shebna who is in charge of the household, and ask him: "What are you doing here, and who are your relatives here that you could carve out a grave for yourself here cutting out a tomb at the choicest location, chiseling out a resting place for yourself out of solid rock?

I will fasten him like a peg into a solid place; he will bring honor and respect to his father's family.

"At that time," says the Lord who commands armies, "the peg fastened into a solid place will come loose. It will be cut off and fall, and the load hanging on it will be cut off." Indeed, the Lord has spoken.