Thus He showed me [a vision], and behold, the Lord was standing by a vertical wall with a plumb line in His hand [to determine if the wall was straight or if it needed to be destroyed].

The Lord said to me, “Amos, what do you see?” And I said, “A plumb line.” Then the Lord said,

“Behold, I am setting a plumb line [as a standard]
Among My people Israel [showing the defectiveness of the nation, requiring judgment].
I shall not spare them any longer. [The door of mercy is shut.]

Therefore, thus says the Lord, ‘Your wife shall become a prostitute in the city [when the Assyrians capture Samaria] and your sons and your daughters shall fall by the sword, and your land shall be divided by a measuring line; you yourself shall die in an unclean and defiled [pagan] land, and Israel shall certainly go from its land into exile.’”