What is the source of the following phrase: “Government of the people, by the people, for the
people”?

The Gettysburg AddressThis was a very notable speech delivered by Abraham Lincoln (Nov. 19, 1863) to the American Civil War Union armies to memorialize the sacrifices made by those who'd died during the Battle of Gettysburg and, in general, to instill the confidence of a continued democracy within the American people, and