Ark of the Covenant - Bible History Online
Bible History

Naves Topical Bible Dictionary

MORTAR, 2. A cement

=>Untempered, not enduring

Ezekiel 22:28

28. And her prophets have daubed them with untempered morter, seeing vanity, and divining lies unto them, saying, Thus saith the Lord GOD, when the LORD hath not spoken.

Untempered, not enduring - MORTAR-2. A cement MORTAR in Naves Topical Bible (Bible History Online)