What was the origin of the Udi, and how did Baba express his joy in relation to it?

The Udi originated from the sacred fire, or Dhuni, that burned constantly, day and night, in the Masjid where Sai Baba resided. As described in Chapter 33, Baba would take handfuls of ash from this very Dhuni to distribute as his Prasad. The text highlights the immense quantity produced, stating that the Dhuni created "countless bags of Udi" that no one could possibly count. The chapter also provides a glimpse into Baba's personal connection with Udi. When he became "absorbed in love" and his mind turned playful and filled with joy, he would repeatedly and sweetly sing a refrain: "Ramate Rama Ayoji Ayoji, Udiyan ki Goniyan Layoji," which translates to "Rama rejoices, O mother, bringing bags of Udi." This demonstrates the deep, joyful, and auspicious sentiment Baba associated with the sacred ash.