Muwatta Malik #1919
General Subjects
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَحَدَّثَنِي مَالِكٌ، أَنَّهُ بَلَغَهُ أَنَّ عُمَرَ بْنَ الْخَطَّابِ، أَرَادَ الْخُرُوجَ إِلَى الْعِرَاقِ فَقَالَ لَهُ كَعْبُ الأَحْبَارِ لاَ تَخْرُجْ إِلَيْهَا يَا أَمِيرَ الْمُؤْمِنِينَ فَإِنَّ بِهَا تِسْعَةَ أَعْشَارِ السِّحْرِ وَبِهَا فَسَقَةُ الْجِنِّ وَبِهَا الدَّاءُ الْعُضَالُ .
Malik related to me that he heard that Umar ibn al-Khattab wanted
to go to Iraq, and Kabal-Ahbar said to him, "Do not go there, amir al-
muminin. There is nine-tenths of sorcery there and it is the place of
the rebellious jinn and the disease which the doctors are unable to
cure."
About Muwatta Malik
This hadith is #1919 from Muwatta Malik, in the Book of General Subjects.