Tom and huck remake there childish oath about not telling who kill the doctor. Then, Huck and Tom visit Muff. This makes Tom more guilty. Finally, Tom tells that he saw the murder and Injun Joe was the murderer. This shows that Tom is mature for being honest.
"I reckon we're safe as long as we keep mum, but lets swear again."
The Salvation of Muff Potter
" You've been mighty good to me boys"
"-and as the doctor fetched the board around and Muff fell, Injun jumped with a knife and-"
Tom and Huck remake there oath, so no one tells about the graveyard.
Tom and Huck visit Muff at the jail.
Tom confessed about seeing the murder, and that Injun joe was the killer.