Don Quixote Volume 2, Chapter 24
The translator of this tale writes that the original Arabic author, Sidi Hamid Benengeli, entered his doubts about the authenticity of this experience of Don Quijote's and mentions that rumor has it that Don Quijote (on his deathbed) admitted to concocting the Montesino Cave experience since it went so nicely with the some of the stories he had read.
They meet up with a man walking next to a jackass loaded with weapons. He explains he is in a hurry, but he'll be spending the night in the inn past the hermitage where he'll share a tale if they meet up there. They then come upon an eighteen year old lad who is on his way to join the army. Don Quijote says he is entering an honorable profession and invites him to join them for dinner at the inn. They arrive at the inn where the man and donkey (carrying the weapons) have already arrived.