What specific text was used in the "Satya-Sai" vow started by the Patil, and why was it considered equivalent to a traditional vow?

The "Satya-Sai" vow, a tradition initiated by the Patil as described in Chapter 13, centered around a specific literary work. Instead of the typical Satyanarayan story, the Patil would read from the "modern Bhaktalilamrut," a book written by Das Ganu. Specifically, he would read the three chapters within that book that sang of Sainath's character. The text states that the Patil considered these chapters to be the "Satya-Sai story" and the "best among all vows." He saw no difference between the traditional vow to Narayan and his vow to Sai, proclaiming, "There it is Narayan, here it is Sai; there is no difference in either," thus establishing this new devotional practice.