Elvis sang a snippet of this tune during the Million Dollar Quartet jam session.
https://youtu.be/MTHrYFAqD4A
The original was written by Bill Monroe.
First recorded by Bill Monroe And His Blue Grass Boys on October 27, 1947.
Released as a single on July 12, 1948 (Columbia 20459). Flip side ‘Little Cabin Home On The Hill’.
A promo disc for radio stations was released on April 12, 1948.
https://youtu.be/qxrmBao8vgo
https://youtu.be/l23jyxEqvn8
Some background info:
The song is about a dying girl who faces the sure prospect of going to heaven, with the opening lyrics; "Our little girl had taken sick one evening as she walked home from school and then her deathbed soon claimed her, it made us so sad and so blue.”
As Robert Cantwell put it in his book Bluegrass Breakdown: "the sick child leaves the world with a rebuke to her parents, whose tears imply that their faith has been shaken."
Bonus: A historical timeline of bluegrass
https://americanamusictriangle.com/timelines/bluegrass/