Ecclesiastes 10:9-11

Complete Jewish Bible

⁹ He who quarries stones may get hurt by them,
he who chops wood puts himself in danger.
¹⁰ If the [hatchet’s] iron [blade] is blunt,
and [its user] doesn’t sharpen it,
he will have to exert more effort;
but the expert has the advantage of his skill.
¹¹ If a snake bites before it is charmed,
the snake-charmer has no advantage.