What happened on the day Babasaheb Tarkhad forgot his promise to Sai, and how did he react to his mistake?

Babasaheb Tarkhad had promised his son he would offer Naivedya to Sai's photograph daily before anyone ate. According to Chapter 9, his ritual was to offer a piece of sugar candy. However, one day, being preoccupied with his business as a chief officer at a large mill, he completely forgot to make the offering. The entire household finished their meals without the Naivedya being offered. When Mr. Tarkhad sat for his meal and realized the omission, he was instantly filled with profound remorse. He immediately went to Sai's image, bowed with tearful eyes, and begged for forgiveness, calling his mistake a 'great sin' and feeling immense repentance. He was so distraught that he also wrote a letter to his son in Shirdi, asking him to plead with Sai Baba for mercy on his behalf.