Why did Sai Baba accept money from one man from Goa but refuse a larger amount from his friend? It seems really unfair.

In a curious incident described in Chapter 36 of the Shri Sai Satcharitra, two gentlemen from Goa visited Sai Baba. Baba specifically asked for and accepted fifteen rupees in Dakshina from one of them, but when the second man voluntarily offered a larger sum of thirty-five rupees, Baba immediately rejected it. This apparent partiality surprised everyone, including Shama, who questioned Baba about it. Baba began his explanation by stating, "I don't take anything from anyone. Mother Masjid demands what is owed, and the giver becomes free from debt." This implies the transaction was not about the money itself but was related to settling a past karmic debt, which is why only the specific amount from the specific person was accepted.