Q, as I'm sure you know, the African American spiritual "In That Great Gettin Up Mornin" includes the refrain "fare thee well, fare thee well".

If you don't mind listening to what is {imo} an awful midi that automatically comes on when you click on this website, here's the words to "In That Great Gettin Up Mornin":

http://my.homewithgod.com/heavenlymidis2/gettinup.html


And here's another version of this song that gives that phrase as "fare you well":
http://www.negrospirituals.com/news-song/in_dat_great_gittin_up_morning.htm