What promise did Babasaheb Tarkhad make to his son, and how did he initially carry it out?

To ease his son's worries about leaving for Shirdi, Babasaheb Tarkhad made a significant promise. He assured his son that he would personally take over the daily worship. Specifically, as mentioned in Chapter 9, he vowed that "Without offering Naivedya to Sai, no one should consume food at home." Upon his son's departure, Tarkhad began to fulfill this vow diligently. He would bathe in the early morning, pray before the painted image of Sai for his service to be accepted, and consistently offer a piece of sugar candy as Naivedya every day, demonstrating his commitment to the promise he made.