Describe the two primary sacred books that were central to the daily spiritual practice in Shirdi as per Baba's instructions.

The two main sacred books that formed the essence of the daily readings in Shirdi were the Bhagavad Gita and the Bhagavat. Chapter 18 clarifies that the specific versions used were Jnaneshwari, also known as Bhavartha Deepika, which is a revered commentary on the Gita, and the eleventh Skandha of the Bhagavat, referred to as the Nath Bhagawat. These texts were considered the platform for attaining the highest spiritual goal. Sai Baba assigned devotees like Sakharam Hari Jog to read them daily in Sathe's Wada, and He would frequently send other devotees to listen, demonstrating the foundational role these two scriptures played in the devotional life He established.