Is the story true about the righteous man who used to send many blessings upon the Prophet, may Allah bless him and grant him peace, and his Jewish neighbor who tried to scheme against him by throwing his ring into the sea, then the ring was found inside a fish, which led to the Jew embracing Islam?

This story has not been found in available books, and some websites have mentioned it without attributing it to anyone. Its phrasing and events suggest that it is a fictional story aiming to illustrate the importance of sending blessings upon the Prophet, peace and blessings be upon him. There is no need for such fictional stories to prove the virtue of sending blessings upon the Prophet, peace and blessings be upon him, for the Book of Allah and the Sunnah of His Messenger, peace and blessings be upon him, contain sufficient and healing evidence for that.