Sayyiduna Abu Hurairah (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) said: "Dreams are of three types: Good dreams are glad tidings from Allah Almighty, frightening dreams are distressing dreams from Satan, and those dreams which a person thinks about in his thoughts and imaginations, he sees in his dreams. Therefore, if any of you sees a bad dream, he should not mention it and should get up and offer prayer."