Darda'il
Encyclopedia
Darda'il are islamic angels who travel in the earth searching out assemblies where people remember God’s name.

Harut and Marut
Harut and Marut
Harut and Marut are two angels mentioned in the second Surah of the Qur'an, who were sent down to test the people at Babel or Babylon by performing deeds of magic....

 are believed to be two angels who came down to Babil
Babylon
Babylon was an Akkadian city-state of ancient Mesopotamia, the remains of which are found in present-day Al Hillah, Babil Province, Iraq, about 85 kilometers south of Baghdad...

. The knowledge gained from these angels was misused by the evil ones in teaching sorcery to the inhabitants there. Qur'anhttp://quran.com/2/102|(2:102).
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