Thus He showed me, and behold, the Lord stood upon a wall with a plumb line, with a plumb line in His hand. [II Kings 21:13; Isa. 34:11.]
And the Lord said to me, Amos, what do you see? And I said, A plumb line. Then said the Lord, Behold, I am setting a plumb line as a standard in the midst of My people Israel. I will not pass by and spare them any more [the door of mercy is shut].