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Shiavault - a Vault of Shia Islamic Books Hayat Al-Qulub, Vol. 1, Stories of the Prophets An Account of Harut and Marut Allah says: And they followed what the Shaitans chanted of sorcery in the reign of Sulayman, and Sulayman was not an unbeliever, but the Shaitans disbelieved, they taught men sorcery and that was sent down to the two angels at Babel, Harut and Marut, yet these two taught no man until they had said, “Surely we are only a trial, therefore do not be a disbeliever.” Even then men learned from these two, magic by which they might cause a separation between a man and his wife; and they cannot hurt with it any one except with Allah’s permission, and they learned what harmed them and did not profit them, and certainly they know that he who bought it should have no share of good in the hereafter and evil was the price for which they sold their souls, had they but known this.
2:102 (In explanation of this holy verse it is said that) Shaitans used to teach magic that was sent down on two angels Harut and Marut in Babylon and these two taught no man until they had said, “Surely we are at trial, therefore do not be a disbeliever.” Even then, men learned from these two, magic by which they might cause a separation between a man and his wife.
‘Ali ibn Ibrahim and Ayyashi have in their tafsirs, narrated from Imam Muhammad al-Baqir that every day and every night, angels used to descend for taking up deeds of the middle men (of the residents of the earth). On seeing these deeds, the residents of the heavens began to find fault in the sins being committed by the dwellers of the earth like disobeying Allah and making false allegations against Him. They used to say that Allah is high and above what the dwellers of the world say about Him.
At last, a group of angels requested Allah: O Nourisher! Do You not frown upon Your creations who make false allegations against You and who disobey You even though You have prohibited them from doing such things? O Lord! You tolerate them even though all of them are in Your control and are living a life of ease due to Your bounties.
So Allah willed to show to the angels what is His perfect Power and how He issues His commandments in the world of His creation, and to make the angels aware of His blessings as they have been created sinless and He has made them distinct among His creations and has made them ever obedient and has not given them the power of sinning.