Can you tell me the story of how Chand Patil met Sai Baba and found his lost mare?

Certainly. The story of Chand Patil's first encounter with Sai Baba is detailed in Chapter 5 of the Shri Sai Satcharitra. Chand Patil, a fortunate Muslim man from Dhup village, had lost his mare for two months and was returning home disappointed from Aurangabad. On his way, under a mango tree, he met a Fakir who was Sai Baba. Baba, who was preparing a chillum, called out to Patil, inviting him to rest. When Baba asked about the saddle Patil was carrying, he learned of the lost horse. As Chapter 5 recounts, Baba then told Patil to search near some streams, where the mare was immediately found. This miraculous event led Chand Patil to realize he had met a great saint, or Avaliya.