What is the 'Satya-Sai vow' that is mentioned in Chapter 13, and what was its origin?

The 'Satya-Sai vow' was a tradition started by the Patil out of profound gratitude for his miraculous healing. As detailed in Chapter 13, this vow was conceived as a parallel to the common practice of performing a Satyanarayan vow to overcome a crisis. The Patil, filled with devotion, began his own version dedicated to Sai Baba. On Thursdays, after bathing, he would read from the 'Bhaktalilamrut' written by Das Ganu. Specifically, he would read the three chapters within that book that detailed the character and stories of Sainath. The Patil considered these chapters to be the 'Satya-Sai story' itself. This act of reading, accompanied by offerings and celebration, became his way of expressing continuous gratitude and eventually became a custom in his village.