The Plumb Line Hasn’t Moved

Amos 7:7-8​ (NIV84)
7This is what he showed me: The Lord was standing by a wall that had been built true to plumb, with a plumb line in his hand.
8And the Lord asked me, "What do you see, Amos?" "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.