Simak bin Harb says: I heard Sayyiduna Nu'man bin Bashir (may Allah be pleased with him) giving a sermon, and he had draped a sheet over himself. He said: I heard the Messenger of Allah (peace and blessings be upon him) say during a sermon: I have warned you about Hell. The Messenger of Allah (peace and blessings be upon him) said this in such a loud voice that if a person had been at such-and-such place, he would have heard it as well.