But while men slept, his enemy came and sowed tares among the wheat, and went his way.

-Bible (NewTestament)
St Matthew13:25.

He that lives in sin and looks for happiness hereafter is likehimthat soweth cockleand thinkstofill hisbarnwith wheat or barley.

-Bunyan,John
  The Pilgrim's Progress, pt.2.

   Editor: a person employed bya newspaper, whose business it isto separate the wheat from the chaff, and to see that the chaff is printed. Hubbard

-Hubbard, Elbert Green
  The Roycroft Dictionary. 1871  Address at Framingham, Massachusetts,31 Aug. Collected in Poems and Essays (1874).

I thought of London spread out in the sun, Its postal districts packed like squares of wheat.

-Larkin, Philip Arthur
  'The Whitsun Weddings'.

Thousands of miles of wheat, indifference, and self- apology.

-Richler, Mordecai
Of Canada. St Urbain's Horseman, ch.1.

Hog Butcher for the World, Tool Maker, Stacker of Wheat, Player with Railroads and the Nation's Freight Handler; Stormy, husky, brawling, City of the Big Shoulders.

-Sandburg, Carl
  Chicago Poems,'Chicago'.