What was the motivation behind the grocers' refusal to give Baba oil, and how did they react when they saw the water-fueled lamps burn all night?

The grocers' motivation was rooted in annoyance. As Chapter 5 explains, Sai Baba would come daily to ask for free oil to light the lamps in the mosque. The grocers developed a "wicked idea" and conspired together, deciding that this "nuisance must stop now." After they refused him and witnessed the subsequent miracle, their reaction was one of utter astonishment and deep regret. They "put their fingers in their mouths," a sign of amazement, and began to tremble. They felt immense repentance, realizing they had sinned by lying to Baba and causing him needless trouble, which showed them the true extent of his power.