What was the 'Satya-Sai vow' that the Patil started, and how did it originate?

The 'Satya-Sai vow' was a new tradition of devotion started by the Patil out of gratitude for his miraculous healing by Sai Baba. According to Chapter 13, the Patil was so filled with joy and thankfulness that he wanted to express his devotion regularly. He adapted the common practice of performing a Satyanarayan vow for deliverance from trouble. Instead, the Patil began performing the Satya-Sai vow every Thursday. This ritual involved reading the three chapters about Sainath from the 'modern Bhaktalilamrut' written by Das Ganu, which he considered the 'Satya-Sai story.' The practice, which included offerings and celebration, became a custom in his village, equating devotion to Sai with devotion to Narayan.