Can you narrate the incident involving the two gentlemen from Goa as described in the Satcharitra?

The story of the two gentlemen from Goa is introduced in Chapter 36. Both men came together for Sai Baba's darshan and surrendered at his feet. A curious event unfolded when Sai asked for Dakshina of fifteen rupees from only one of the men, who gave it joyfully. When the second gentleman, unprompted, tried to offer thirty-five rupees, Sai Baba immediately rejected the offering. This apparent partiality surprised everyone present, including Madhavrao (Shama), who then questioned Sai about his actions, setting the stage for a deeper lesson.