Ecclesiastes 10:8-11King James Version (KJV)
8 He that diggeth a pit shall fall into it; and whoso breaketh an hedge, a serpent shall bite him.
9 Whoso removeth stones shall be hurt therewith; and he that cleaveth wood shall be endangered thereby.
10 If the iron be blunt, and he do not whet the edge, then must he put to more strength: but wisdom is profitable to direct.
11 Surely the serpent will bite without enchantment; and a babbler is no better.