It is Aarne-Thompson type 327 C, the devil (witch) carries the hero home in a sack.
His mother had him hide under the kneading trough, but the witch said she had a silver knife to give him and this lured him out.
"[a] and Buttercup said half a mile, so she rested and, using the knife, he escaped, putting a big fir root in the sack.
The next day, the witch lured him out again with the offer of a silver spoon, but he escaped in the same way, placing a stone in the sack.
They went outside to see what caused the noise, and Buttercup killed them by dropping the stone and root on their heads.