Why did the grocers refuse to give Baba oil, and how did they react to his miracle of lighting lamps with water?

The grocers decided to stop giving Baba oil because they grew tired of his daily requests and came to see it as a 'nuisance.' Chapter 5 states they had a 'wicked idea' and conspired together to refuse him. However, their reaction to the subsequent miracle was one of shock and repentance. Upon seeing the lamps burn all night with water, they 'put their fingers in their mouths' in amazement. They realized they had sinned by lying to Baba and began to tremble, feeling deep repentance for having given him needless trouble.