What specific promise did Sai Baba make regarding the niche at Sathe's Wada?

Chapter 4 recounts a specific promise made by Sai Baba himself concerning a beautiful niche, or 'Konada', located under the northern staircase at Sathe's Wada. This niche faced south, and devotees would sit on the platform in front of it. Baba's own words, as heard by devotees who were still alive at the time of the writing, were: "On Thursdays and Fridays, after smearing the surface with cow-dung at sunset; Whoever burns incense for a moment, Shri Hari will give them happiness." The author stresses that this is not an exaggeration but a direct quote from Sai, urging listeners not to have even an atom of doubt about its truth.