Describe the incident where Babasaheb Tarkhad failed in his duty and his subsequent reaction of extreme remorse.

One day, Babasaheb Tarkhad, who was the chief officer of a large mill, became preoccupied with his business and forgot to offer the daily Naivedya of sugar candy to Sai Baba. Chapter 9 recounts that he only realized his mistake when he sat down for his meal and the customary 'Prasad' was not served. His reaction was not one of simple regret but of profound remorse. Filled with grief and with tears in his eyes, he bowed to Sai's image, calling his mistake a "great sin" for which he felt deep repentance. He felt he had failed and was shameless, begging for mercy. This distress was so great that he immediately wrote a letter to his son in Shirdi, confessing his "great error" and asking him to seek forgiveness from Sai on his behalf.