Nehemiah 4:3

Now Tobiah the Ammonite was by him
Who was one of his brethren he spake before, ( Nehemiah 4:2 ) ,

and he said;
in the like contemptuous and scoffing manner;

even that which they build, if a fox go up, he shall break down their
stone wall;
signifying not only that it was so low that a fox could easily get up to it, or leap over it; but that the materials were so bad, and the work so poorly done, that the weight of a fox would break it down; of which creatures many were thereabout, since Jerusalem was desolate, see ( 5:18 ) .