One old woman made a habit of throwing rubbish on Prophet Muhammad (pbuh) whenever he passed from her house. Prophet Muhammad (pbuh) had to pass that house daily on the way to the mosque. Even when the old woman threw rubbish on him, he would pass silently without showing any anger or annoyance. This was a regular, daily event.
Prophet Muhammad (pbuh) Biography: Kindness and Forgiveness
One day when Prophet Muhammad (pbuh) was passing by the woman was not there to throw the rubbish. Prophet Muhammad (pbuh) stopped and asked the neighbor about her well-being. The neighbor informed the Prophet Muhammad (pbuh) that the woman was sick on bed. The Prophet Muhammad (pbuh) politely asked permission to visit the woman. When allowed he entered the house, the woman thought that he had come there to take his revenge when she was unable to defend herself because of sickness. But the Prophet Muhammad (pbuh) assured her that he had come to her, not to take any revenge, but to see her and to look after her needs, as it was the command of Allah that if any one is sick, a Muslim should visit him and should help him if his help is needed.
The old woman was greatly moved by this kindness and love of Prophet Muhammad (pbuh). By the example of greatness of Prophet Muhammad (pbuh), she understood that he was truly the Prophet of Allah and Islam was the true religion. She accepted Islam at once.