On January 20, 1961, John F. Kennedy used his inaugural address to urge Americans toward civic duty and service to their country.
In his inaugural address on January 20, 1961, John F. Kennedy declared: Ask not what your country can do for you; ask what you can do for your country.

Kennedy's Inauguration Speech Resonates 50 Years Later | PBS News Hour Classroom
Source: pbs.org
Key Evidence
The John F. Kennedy Presidential Library and Museum includes the passage in its account of Kennedy’s inaugural appeal for service to the public good.
Oxford University Press and the Gilder Lehrman Institute identify the wording as part of Kennedy’s inaugural address delivered on January 20, 1961.
The claim accurately conveys an excerpt from the speech. In the complete sentence, Kennedy first addresses his fellow Americans, then later connects the appeal to broader cooperation among America and other nations in support of human freedom.
What the Evidence Shows
During his inaugural address on January 20, 1961, John F. Kennedy urged Americans to consider their own contributions to the nation rather than focusing solely on what the country might provide for them. The John F.
Kennedy Presidential Library and Museum presents this passage as an appeal for citizens to serve the public interest.jfklibrary.orgjfklibrary.org"Ask Not What Your Country Can Do For You..."
gilderlehrman.orggilderlehrman.orgJohn F. Kennedy’s Inaugural Address, 1961