Ecclesiastes 10:8-11

8Whoever digs a pit may fall into it; whoever breaks through a wall may be bitten by a snake.

9Whoever quarries stones may be injured by them; whoever splits logs may be endangered by them.

10If the ax is dull and its edge unsharpened, more strength is needed, but skill will bring success.

11If a snake bites before it is charmed, the charmer receives no fee.