He had not noticed that sewage was leaking from his house into that of the Imam.
When the neighbour pressed him, the Imam finally said: "For some months your drain has been seeping through to our side. I tried to fix it, but without success."
His neighbour asked why he had not told him before, but the venerable Imam said: "I might have offended you."
The unbeliever was so impressed by this ethical refinement that he was ennobled with True Faith, for he recognized the Imam's morality as a ray of Islam.