Describe the story of Das Ganu's pilgrimage to Prayag as told in Chapter 22.

The story of Das Ganu in Chapter 22 illustrates the immense power contained within Sai Baba's feet. When Das Ganu sought permission to go bathe in the holy waters at Prayag, Baba instructed him not to go. Instead, Baba told him, "Know this big toe of Mine to be Prayag; bathe right here." As soon as Das Ganu accepted this and placed his head upon Baba's feet, the sacred waters of both the Ganga and Yamuna rivers manifested and flowed from that very spot, satisfying his desire for a holy bath and demonstrating that the Sadguru's feet are the ultimate pilgrimage site.