Describe the specific promise Babasaheb Tarkhad made to his son that allowed the son to travel to Shirdi.

As detailed in Chapter 9, the son was unwilling to travel to Shirdi because he feared the daily worship of Sai Baba would be neglected. To overcome this, he made a specific request to his father, Babasaheb Tarkhad. The son stated, "Without offering Naivedya to Sai, no one should consume food at home." He declared that his going would not happen unless this was accepted. His father, understanding his son's vow, gave him a firm assurance. He promised, "Go, I will offer Naivedya daily; be certain," and added, "Without first dedicating to Sai, no one will consume food." It was only upon receiving this solemn promise that the son felt secure enough to set out for Shirdi.