Deuteronomy 20:19-20

new(i)
  19 H6696 [H8799] When thou shalt besiege H5892 a city H7227 a long H3117 time, H3898 [H8736] in making war H8610 [H8800] against it to take H7843 [H8686] it, thou shalt not decay H6086 the trees H5080 [H8800] of it by forcing H1631 an axe H398 [H8799] against them: for thou mayest eat H3772 [H8799] of them, and thou shalt not cut them down H6086 (for the tree H7704 of the field H120 is man's H935 [H8800] life) to employ H6440 H4692 them in the siege:
  20 H6086 Only the trees H3045 [H8799] which thou knowest H6086 that they are not trees H3978 for food, H7843 [H8686] thou shalt decay H3772 [H8804] and cut them down; H1129 [H8804] and thou shalt build H4692 bulwarks H5892 against the city H6213 [H8802] that maketh H4421 war H3381 [H8800] with thee, until it shall be subdued.