What is the origin of "in one fell swoop"?

Question

I know the meaning, but wanted to know the origin of the phrase.

user11550 · Accepted Answer

Wiktionary says it originated in Shakespeare's MacBeth:

Ro. Wife, Children, Seruants, all that could be found. […]
  Macd. […] All my pretty ones?
  Did you ſay All? Oh Hell-Kite! All?
  What, All my pretty Chickens, and their Damme
  At one fell swoope?

What is the origin of "in one fell swoop"?

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