The Prophet (may Allah's peace and blessings be upon him) went out after the sun had set. He heard a sound and then said: The Jews are being tormented in their graves
Authentic hadithعن أبي أيوب رضي الله عنه، قال: خرج النبي صلى الله عليه وسلم وقد وَجَبَت الشمس، فسمع صوتا فقال: «يهودُ تُعذَّب في قبورها».
Abu Ayyūb (may Allah be pleased with him) reported: The Prophet (may Allah's peace and blessings be upon him) went out after the sun had set. He heard a sound and then said: "The Jews are being tormented in their graves."
Explanation
The Prophet (may Allah's peace and blessings be upon him) went out after the sun had set. He heard the voice of the Jews while being tormented. He said that this was the voice of the Jews while being tormented in their graves.
Source · Narrated by Bukhari & Muslim
From the Hadith Encyclopedia (hadeethenc.com).