What is the primary subject and daily practice described in Chapter 33 of the Shri Sai Satcharita?

Chapter 33 of the Shri Sai Satcharita primarily focuses on the glory and significance of Udi, or sacred ash. The chapter explains that Sai Baba would keep a sacred fire, the Dhuni, constantly burning in the Masjid. He would offer dry logs into this fire, and the resulting ash was the Udi he distributed. According to the text, it was his daily practice to give this Udi to devotees, whether they were staying in Shirdi or asking for permission to leave for their villages. As Chapter 33 mentions, Baba would not send anyone away empty-handed in the mornings, afternoons, or evenings, making the distribution of Udi a well-known and consistent ritual.