In 1865, an ex-slave, Jourdan Anderson, wrote to his former 'master' in Tennessee. Apparently, the latter had invited Jourdan to return to his home for a 'good chance' and freedom papers.
The letter appeared in several post-war publications, including the New York Tribune and the Cincinnati Commercial. It has also been published in "The Freedmen's Book"¹, "The Eloquent War"² and "Been In The Storm So Long"³.

It is the "Lest We Forget" website that I have referenced for a copy of this eloquent letter.

¹Child, Lydia Maria. The Freedmen's Book. Boston: Tickenor and Fields, 1865.

²Bodden, Donna, and Eleanor Lang, ed. The Eloquent War: Personal and Public Writings from the Civil War, 1860-1865. Naugutuck: Brandywine Press, 1999

³Litwack, Leon F. Been in the Storm So Long: The Aftermath of Slavery. paperback ed. New York: Vintage, 1980.