Please describe the incident with the two gentlemen from Goa as it is told in the Satcharitra.

Chapter 36 recounts the story of two gentlemen from Goa who came for Sai Baba's darshan. After they both surrendered at his feet, a curious event took place regarding Dakshina. As detailed in this chapter, Sai Baba specifically requested fifteen rupees from one of the men, which the man gave joyfully. However, when the second gentleman offered thirty-five rupees on his own accord, Sai Baba immediately rejected the offering. This apparent partiality surprised everyone present, including Madhavrao (Shama), who then questioned Baba about it.