Can you explain the origin and practice of the "Satya-Sai vow" as described in the source material from Chapter 13?

The "Satya-Sai vow" was a tradition started by the grateful Patil mentioned in Chapter 13. After being miraculously cured by Sai Baba, he wanted to show his gratitude and adapted the existing practice of the Satyanarayan vow. As detailed in the chapter, on every Thursday after bathing, the Patil would read three specific chapters about Sainath from the "Bhaktalilamrut," a book written by Das Ganu. He would make an offering (Naivedya) and celebrate, viewing Sai as equivalent to Narayan. This practice, which brought him "boundless happiness" and peace, became a custom in his village.