A dictionary of Proverbs (Oxford Paperback Reference)

fence see GOOD fences make good neighbours; the GRASS is always greener on the other side of the fence.
fetch see a DOG that will fetch a bone will carry a bone.
fever see FEED a cold and starve a fever.
few see MANY are called but few are chosen; you WIN a few, you lose a few.
fiction see FACT is stranger than fiction; TRUTH is stranger than fiction.
fiddle see there’s many a GOOD tune played on an old fiddle.
fiddler see they that DANCE must pay the fiddler.
FIELDS have eyes, and woods have ears
The urban equivalent is WALLS have ears.

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  с 1225 in Englische Studien (1902) XXXI. 8 Veld haued hege [eye], and wude haued heare—Campus habet lumen et habet nemus auris acumen. c 1386 CHAUCER Knight’s Tale 1.1522 But sooth is seyd, go sithen many yeres, That ‘feeld hath eyen and the wode hath eres’. 1640 J. HOWELL Dodona’s Grove A4^V Hedges have eares, the rurall Proverb sayes. 1738 SWIFT Polite Conversation iii. 199 ‘O, Miss; ‘tis nothing what we say among ourselves.’.. ‘Ay Madam; but they say Hedges have Eyes, and Walls have Ears.’ 1905 S. J. WEYMAN Starvecrow Farm xxviii. Heedful of the old saying, that fields have eyes and woods have ears, she looked carefully round her before she laid her hand on the gate. ^eavesdroppers
  

FIGHT fire with fire
An injunction to counter like with like. Cf. early 14th-cent. Fr. lung feu doit estaindre lautre, one fire must put out another; 1608 SHAKESPEARE Coriolanus IV. vii. 54 One fire drives out one fire; one nail, one nail.

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  1846 J. F. COOPER Redskins III. i. If ‘Fire will fight fire’, ‘Indian’ ought to be a match for ‘Injin’ any day. 1869 P. T. BARNUM Struggles & Triumphs xl. I write to ask what your intentions are. .. Do you intend to fight fire with fire? 1980 C. SMITH Cut-out ix. ‘You think the other Palestinians have hired some heavies as well?’ ‘Why not? Fight fire with fire.’ "similarity and dissimilarity; ways and means
  

fight see also COUNCILS of war never fight; when ELEPHANTS fight, it is the grass that suffers; while TWO dogs are fighting for a bone, a third runs away with it.