Can you summarize the introduction to the story about the Agnihotri from Nashik as told in Chapter 12?

Chapter 12 introduces a forthcoming story by describing a ritualistic and orthodox Agnihotri (a keeper of the sacred fire) named Mule from Nashik. The text emphasizes that his arrival in Shirdi was not a random event but occurred due to the "strength of his past merits." It makes the significant point that without such accumulated merit, a person cannot stay in Shirdi even for a moment. The chapter sets up a narrative twist by mentioning that the Agnihotri's original intention was different, but a fortunate coincidence led him to Shirdi, where he gained the ultimate benefit of having a rare meeting with Sai Baba, his Guru.