What promise did Babasaheb Tarkhad make to his son, and what happened when he broke it?

Babasaheb Tarkhad made a solemn promise to his son that he would continue the daily worship of Sai Baba in his absence. Chapter 9 details this assurance, where the father states, "Without first dedicating to Sai, no one will consume food." He specifically promised to offer the Naivedya every day. However, one day, being preoccupied with business, Tarkhad forgot to offer the sugar candy Naivedya. The entire family ate their meals without the offering being made. Upon realizing this oversight at the dining table, he was filled with immense remorse, considering it a great sin and a failure of his vow.