not hurt a fly
Also, not hurt a flea. Not cause harm to anyone, be gentle and mild, as in Paul's the kindest man—he wouldn't hurt a flea, or Bert has a temper but it's all talk; he wouldn't hurt a fly. Both fly and flea are used in the sense of “a small insignificant animal.” [Early 1800s]
QUIZ YOURSELF ON "WAS" VS. "WERE"!
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Example sentences from the Web for not hurt a fly
ROME — What does it take for a Hollywood A-lister to get a private audience with Pope Francis?Pope Francis Has the Pleasure of Meeting Angelina Jolie for a Few Seconds|Barbie Latza Nadeau|January 8, 2015|DAILY BEAST
The offices were firebombed in 2011; no one was hurt but a permanent police car was subsequently stationed outside.
Andrew still plans to fly to Davos in Switzerland for the World Economic Forum on January 21, representing the British government.
In 2012, as a 10th grader, Lean says he recorded his first legitimate song, “Hurt.”The Cult of Yung Lean: ‘I’m Building An Anarchistic Society From the Ground Up’|Marlow Stern|January 4, 2015|DAILY BEAST
After some animated debate at the conference, Lelaie declared, with some frustration, “If you push on the stick, you will fly.”Flight 8501 Poses Question: Are Modern Jets Too Automated to Fly?|Clive Irving|January 4, 2015|DAILY BEAST
Now-a-days it is the bankrupt who flouts, and his too confiding creditors who are jeered and laughed at.Glances at Europe|Horace Greeley
He felt himself the meanest, vilest thing a-crawl upon this sinful earth, and she—dear God!St. Martin's Summer|Rafael Sabatini
Forget it not: for there is no returning, and thou shalt do him no good, and shalt hurt thyself.The Bible, Douay-Rheims Version|Various
All that scientific bric-a-brac in the cupboard had far better be thrown away.The Salvaging Of Civilisation|H. G. (Herbert George) Wells
Such throats are trying, are they not?In case one catches cold; Ah, yes!