Narrated Ibn ‘Umar, The Prophet said:
“Oppression will be a darkness on the Day of Resurrection.”
Sahih Bukhari, Volume 3, Book 43, Number 627.
Narrated Ibn ‘Abbas: The Prophet sent Mu’adh to Yemen and said,
“Be afraid, from the curse of the oppressed as there is no screen between his invocation and Allah.“
Shahih Bukhari, Volume 3, Book 43, Number 628.
“Spreading Hadith One Post Per Day” series.
Hadith # 25.