Ecclesiastes 10:9-11

Amplified Bible, Classic Edition

⁹ Whoever removes [landmark] stones or hews out [new ones with similar intent] will be hurt with them, and he who fells trees will be endangered by them.^(A)

¹⁰ If the ax is dull and the man does not whet the edge, he must put forth more strength; but wisdom helps him to succeed.

¹¹ If the serpent bites before it is charmed, then it is no use to call a charmer [and the slanderer is no better than the uncharmed snake].