Can you explain the 'Satya-Sai vow' mentioned in Chapter 13 and its origin?

The 'Satya-Sai vow' is a devotional practice initiated by the grateful Patil, as detailed in Chapter 13. After being miraculously healed by Sai Baba, the Patil wanted to show his gratitude. He adapted the tradition of the Satyanarayan vow, which people performed to overcome crises. Instead of the traditional story, the Patil's vow involved reading the three chapters about Sainath from Das Ganu's 'Bhaktalilamrut' on Thursdays. The chapter explains that he saw no difference between Narayan and Sai. This new tradition, born from his profound experience of Sai's grace, brought him and his fellow villagers boundless happiness and peace, becoming a regular custom.