For a devotee wishing to leave Shirdi, what was the specific role and significance of receiving Udi from Baba as described in Chapter 33?

As narrated in Chapter 33, receiving Udi was a crucial part of a devotee's departure from Shirdi. When devotees asked for Baba's permission to return to their villages, the formal practice was for Baba to give them Udi. The text states that when Baba said, "Take the Udi," true permission was considered granted. This act would fill the devotee's mind with enthusiasm for their journey home. This practice was known to all devotees and was more than just a farewell gesture; it was the definitive sign of Baba's consent and blessing for their travels, reinforcing the bond between Guru and disciple even as they parted.