This 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.  And 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.”

Amos 7: 7 - 17 NIV