It is narrated from Sayyiduna Nu'man bin Bashir (may Allah be pleased with both of them), he says that the Messenger of Allah (peace and blessings be upon him) said: "Indeed, before the Day of Resurrection there will be such tribulations as if they are pieces of a dark night. A man will be a believer in the morning and a disbeliever in the evening, and in the evening he will be a believer and in the morning a disbeliever. People will sell their share (of religion) for a small portion of worldly goods, or (he said) for worldly goods."