What exactly was the 'Satya-Sai vow' initiated by the Patil, and how was it performed?

The 'Satya-Sai vow' was a new tradition of worship started by the Patil to show his gratitude for being cured. Chapter 13 explains that he began to perform this vow regularly on Thursdays. After bathing, the Patil would read from the 'modern Bhaktalilamrut,' a book written by Das Ganu. Specifically, he would read the three chapters within that book dedicated to the character of Sainath, which the text itself calls the 'Satya-Sai story.' This practice, which included the same abundance of offerings as a Satyanarayan puja, was performed with a joyful mind among friends and family. The Patil effectively started a new custom in his village, drawing a parallel between the worship of Narayan and Sai.