* two birds.  or, sparrows.
   The word {tzippor,} from the Arabic {zaphara,} to fly, is used
   in the Scriptures to denote birds of every species,
   particularly small birds.  But it is often used in a more
   restricted sense, as the Hebrew writers assert, to signify the
   sparrow.  Aquinas says the same; and Jerome renders it here
   the sparrow.  So the Greek [strouthia,] in Matthew and Luke,
   which signifies a sparrow, is rendered by the Syriac
   translator {tzipparin}, the same as the Hebrew {tzipporim}.
   Nor is it peculiar to the Hebrews to give the same name to the
   sparrow and to fowls of the largest size; for Nicander calls
   the hen [strouthos katoikados,] the domestic sparrow, and both
   Plautus and Ausonius call the ostrich, {passer marinus,} "the
   marine sparrow."  It is evident, however, that the word in
   this passage signifies birds in general; for if the sparrow
   was a clean bird, there was no necessity for commanding a
   clean one to be taken, since every one of the species was
   ceremonially clean; but if it was unclean, then it could not
   be called clean.

  1:14  5:7  12:8 
 * cedar.
  6,49-52  Nu 19:6 
 * scarlet.
  Heb 9:19 
 * hyssop.
  Ex 12:22  Nu 19:18  Ps 51:7