What was the specific meaning of receiving Udi from Baba when a devotee was preparing to leave Shirdi?

As described in Chapter 33, receiving Udi from Sai Baba before departing from Shirdi had a very practical and significant meaning for devotees. It was a well-known custom that when devotees asked for permission to return to their villages, Baba would give them Udi. The chapter clarifies that when Baba said, "Take the Udi," it was understood as the true and final granting of permission for the journey. This act of receiving the sacred ash would fill the departing devotee's mind with enthusiasm for their return. This practice was a consistent part of Baba's interactions and a cherished signal for those leaving his presence.