Which sacred books did Sai Baba have read daily in Shirdi, and why did he consider them so important?

The source material from Chapter 18 highlights two main sacred texts: the Bhagavat (specifically the Nath Bhagawat or Uddhava Gita) and the Bhagavad Gita, along with its renowned commentary, the Jnaneshwari. Sai Baba considered these books divinely inspired and essential for spiritual growth. He ordered these readings for the 'salvation of souls' and for the general welfare of devotees. Chapter 18 states Baba's belief that one did not need to retreat to a forest for salvation, as those who perform the reading of these books with faith could attain God instantly, demonstrating the immense spiritual power he attributed to them.