What is the 'Satya-Sai vow' mentioned in Chapter 13, and how did this tradition begin?

The 'Satya-Sai vow' is a tradition of worship started by the grateful Patil. As explained in Chapter 13, it was common for people in trouble to vow to perform a Satyanarayan puja. The Patil adapted this practice to show his devotion to Sai Baba. On Thursdays, after bathing, he would read the three chapters dedicated to Sainath from Das Ganu's book, the 'Bhaktalilamrut.' He considered this reading to be his 'Satya-Sai story,' seeing no difference between the divine Narayan and Sai. The Patil started this tradition of reading these specific chapters with offerings and celebration, and it eventually became a custom in his village, performed regularly with a joyful mind.