Which devotee was told by Sai Baba that Vitthal would appear if they were full of faith?

According to Chapter 4, it was Das Ganu who was instructed by Sai Baba to organize a Name-week (Saptah) and was assured that the form of Vitthal would appear. Baba placed a hand on his chest and firmly stated, "Yes, yes, the form of Vitthal will appear! But the devotee must be full of faith." Baba emphasized that Shirdi itself was a holy place, like Pandhari or Dwarka, and that one need not go far to see God. The text confirms that at the end of the Saptah, Das Ganu did receive the sight of Vitthal in Shirdi, serving as proof of Baba's words.