First the text of the curse then my commentary.

Genesis chapter 9

20 Noah was the first tiller of the soil. He planted a vineyard; 21 and he drank of the wine, and became drunk, and lay uncovered in his tent. 22 And Ham, the father of Canaan, saw the nakedness of his father, and told his two brothers outside. 23 Then Shem and Japheth took a garment, laid it upon both their shoulders, and walked backward and covered the nakedness of their father; their faces were turned away, and they did not see their father