Who was Appasaheb, and what was the story behind his unfulfilled promise?

Appasaheb was a devotee who, feeling a donation made by his family was insufficient, made a verbal promise that he would have given ten Rupees. According to Chapter 33, he later forgot this vow. Subsequently, a Fakir, implied to be Sai Baba, came to him for dakshina. However, Appasaheb became suspicious because this Fakir was a stranger. Despite having six Rupees available, he hesitated and did not offer the money, thus failing to fulfill his word at that moment and becoming indebted.