Qur'an, Hadith and Scholars:Sharr(Evil)
Sharr (شرّ in Arabic) means evil of thought, deed, action, or in the cosmic sense, and is often translated as "mischief" in English translations of Islamic texts.
Narrated Abu Said Al-Khudri:
Somebody asked, "O Allah's Apostle! Who is the best among the people?" Allah's Apostle replied "A believer who strives his utmost in Allah's Cause with his life and property." They asked, "Who is next?" He replied, "A believer who stays in one of the mountain paths worshipping Allah and leaving the people secure from his mischief."
It has been narrated on the authority of Abu Sa'id Khudri that a man came to the Holy Prophet (may peace he upon him) and said: Who is the best of men? He replied: A man who fights in the way of Allah spending his wealth and staking his life. The man then asked: Who is next to him (in excellence)? He said: Next to him is a believer who lives in a mountain gorge worshipping hid Lord and sparing men from his mischief.
It has been narrated (through a diferent chain of transmetters) on the same authority (i. e. Abu Sa'id Khadri) who said: A man asked: Messenger of Allah, which of men is the best? He said: A believer who fights staking his life and spending his wealth in the way of Allah. He asked: Who is next to him (in excellence)? He said:[b] Next to him is a man who lives an isolated life in a mountain gorge, worshipping his Lord and sparing men from his mischief.
Abu Dharr reported: I said: Messenger of Allah, which of the deeds is the best? He (the Holy Prophet) replied: Belief in Allah and Jihad in His cause. I again asked: Who is the slave whose emancipation is the best? He (the Holy Prophet) replied: One who is valuable for his master and whose price is high. I said: If I can't afford to do it? He (the Holy Prophet) replied: Help an artisan or make anything for the unskilled (labourer). I (Abu Dharr) said: Messenger of Allah, you see that I am helpless in doing some of these deeds. He (the Holy Prophet) replied: Desist from doing mischief to the people. That is the charity of your person on your behalf.
Abu Salama replied: I used to see (such horrible dreams) that I fell ill. I saw Abu Qatada who also said: I used to see dreams which made me sick until I heard Allah's Messenger (may peace be upon him) as saying: Good dreams are from Allah, so if any one of you sees which he likes he should not disclose it to one but whow he loves, but if he sees something which he does not like he should spit on his left side thrice and seek refuge with Allah from the mischief of the satan and its mischief (i. e. of the dream), and he should not relate it to anyone, then it would not harm him.