What was the 'Satya-Sai vow' mentioned in Chapter 13, and how did it originate?

The 'Satya-Sai vow' was a tradition started by the grateful Patil after Sai Baba miraculously cured him of his disease. According to Chapter 13, the Patil was so overwhelmed with gratitude that he wanted to show his devotion in a tangible way. He began a practice analogous to the Satyanarayan vow. On Thursdays, the Patil would read the three chapters detailing Sainath's life from Das Ganu's 'Bhaktalilamrut.' He considered these chapters to be the 'Satya-Sai story' and the 'best among all vows.' This act of devotion, which included offerings and celebrations, became a regular custom in his village, demonstrating his enduring faith and gratitude for Sai's 'inconceivable and unfathomable' grace.