What is the significance of receiving Udi from Sai Baba when one is trying to leave Shirdi?

According to the teachings in Chapter 35, receiving Udi Prasad from Sai Baba holds a very specific and crucial significance for departure. The text states that one must have Baba's permission to leave, and transgressing this command can lead to obstacles and remorse. Sai himself is quoted as saying, "Without my wish, who will leave the doorstep?" The process of seeking this permission involves bowing to Baba, and the text clarifies that the blessing, given along with the Udi, is the actual permission to leave. Therefore, receiving the Udi is not just a parting gift but a necessary sanction from Baba, without which no one is granted leave.