The wall
Neemias 4:3
Now Tobiah the Ammonite was by him, and he said, Even that which they build, if a fox goes up, he shall even break down their stone wall.
Salmos 62:3
How long will you imagine evil against a man? you shall be slain all of you: as a leaning wall shall you be, and as a tottering fence.
Isaías 30:13
Therefore this iniquity shall be to you like a breach ready to fall, a bulge in a high wall, whose breaking comes suddenly, in an instant.