His name was Azazeel. He is also known as Iblees. He used to pray a lot and even used to give lectures to the angels. One day there was a notice in the heavens which said that someone was going to be ordered out of the heavens. All the angels were worried because they thought it might be one of them. They all went to Jibreel (Gabriel) who was one of the most important angels to ask him, whether he could do anything. Jibreel (Gabriel) said he too was worried because it might be himself. Jibreel (Gabriel) suggested that they go to Azazeel because he was very clever.

Azazeel told them not to worry at all, he would pray to Allah (SWT) for all of them. He forgot himself thinking he was the best and it could never be him. As a result of overconfidence, he became the cursed Satan and he was ordered out of heaven.

Imam Moosa Kazim (as) says: "O Son! Don't delay in offering your prayers. Nor should you be overconfident of the acceptance of your prayers and feel proud of your efforts at piety. We cannot offer prayers and obedience to Allah commensurate with His Blessings."

Summary, as human beings and believers, we need to ensure that we do not repeat the sin which resulted in the fall of Satan - we need to treat all of the children of Adam as human beings and not be judgmental of things such as skin color, tribal affiliations, language, place of birth, economic worth, social status, or even religion, as these are all merely ways for us to "know the another" rather than being means of shunning one another. After all, did Imam Ali (as) not say that, "People are of two types - they are either your brothers in faith or your equals in humanity."