Plumb Line
This is what he showed me: The Lord was standing by a wall that had been built true to plumb,[a] with a plumb line[b] in his hand. 8 And the Lord asked me, “What do you see, Amos?”
Amos 7:7-8
“A plumb line,” I replied.
Then the Lord said, “Look, I am setting a plumb line among my people Israel; I will spare them no longer.