What happened when the two gentlemen from Goa came to visit Sai Baba?

According to the account in Chapter 36 of the Shri Sai Satcharitra, when two gentlemen from Goa came for Sai Baba's darshan, a peculiar event occurred regarding Dakshina. Though both men surrendered at Baba's feet, Sai specifically asked for fifteen rupees from only one of them, which was given 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 his actions, setting the stage for a deeper teaching.