It is narrated from Hazrat Abu Saeed Khudri (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: If any one of you performs a deed while hiding in a closed rock which has neither an opening nor a window, even then that deed of his will come before the people. Whatever the deed may be (good or bad).

And the Prophet (peace and blessings be upon him) said that if a bucket of "Ghassaq" (the water of Hell) were to be poured out on the earth, its stench would spread throughout the whole world.

And the Prophet (peace be upon him) said that the earth consumes everything of the human except the coccyx (tailbone). Someone asked, "O Messenger of Allah! How much of the coccyx remains?" He replied, "As much as a mustard seed, and from that you will be resurrected again."