Kohelet 10:8-10

Orthodox Jewish Bible

⁸ He that diggeth a gumatz (pit) shall fall into it; and whoso breaketh through a wall, a nachash shall bite him.

⁹ Whoso pulleth out avanim (stones) may be hurt therewith; and he that cleaveth wood may be endangered thereby.

¹⁰ If the barzel (iron [of the axe]) be blunt, and he do not whet the edge, then must more strength be marshalled; but chochmah brings success.