“The grave will fall in upon him who digs it.”
The Notebooks of Leonardo da Vinci (1883), XIX Philosophical Maxims. Morals. Polemics and Speculations.
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Leonardo Da Vinci 363
Italian Renaissance polymath 1452–1519Related quotes

"He who had dug his own grave", from To Abel and Cain, commemorating his escape from the Nazis by his 1943 killing of an SS guard who had been assigned to watch as he dug his own grave, as quoted in "10 Amazing Ways People Survived The Holocaust" by Alan Boyle at Listverse (9 November 2014) http://listverse.com/2014/11/09/10-amazing-ways-people-survived-the-holocaust/

“Any actress who appears in public without being well-groomed is digging her own grave.”

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 537.

“Before you enbark on a journey of revenge, dig two graves.”
Source: Perfect

“Before you embark on a journey of revenge, dig two graves.”
Attributed in Lillet Walters (2000), Secrets of Superstar Speakers; attributed in English sources as a "Japanese proverb" as early as 1924
Misattributed, Not Chinese

“Whoever finishes a revolution only halfway, digs his own grave.”
Act I.
Dantons Tod (Danton's Death) (1835)

“If you dig a pit for others to fall into,
you will fall into it yourself.”
Rumi Daylight (1990)
“In his heart, Simon Yakida knew he was digging his own grave.”
Ghost Nation: An Ethnic Cleansing Campaign by the Government Threatens to Empty South Sudan https://harpers.org/archive/2017/07/ghost-nation/ , July 2017