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In the Yazidi belief system, God created the world and it is now in the care of a Heptad of seven Holy Beings, often known as Angels or heft sirr (the Seven Mysteries). Preeminent among these is Tawûsê Melek (frequently known as "Melek Taus" in English publications), the Peacock Angel. According to the Encyclopedia of the Orient,
Furthermore, the Yazidi story regarding Tawûsê Melek's rise to favor with God is almost identical to the story of the jinn Iblis in Islam, except that Yazidis revere Tawûsê Melek for refusing to submit to Adam, while Muslims believe that Iblis' refusal to submit caused him to fall out of Grace with God, and to later become Satan himself.
Tawûsê Melek is often identified by Muslims and Christians with Shaitan (Satan). Yazidis, however, believe Tawûsê Melek is not a source of evil or wickedness. They consider him to be the leader of the archangels, not a fallen angel. They are forbidden from speaking the name Shaitan. They also hold that the source of evil is in the heart and spirit of humans themselves, not in Tawûsê Melek. The active forces in their religion are Tawûsê Melek and Sheik Adî.
Religious significance 
The Yazidi consider Tawûsê Melek an emanation of God and a benevolent angel who has redeemed himself from his fall and has become a demiurge who created the cosmos from the Cosmic egg. After he repented, he wept for 7,000 years, his tears filling seven jars, which then quenched the fires of hell.
Tawûsê Melek is sometimes transliterated Malak Ta'us, Malak Tawus, or Malik Taws. Melek was borrowed from the Arabic term "king" or "angel". Tawûs is uncontroversially translated "peacock"; in art and sculpture, Tawûsê Melek is depicted as peacock. However, peacocks are not native to the lands where Tawûsê Melek is worshipped.
The Kitêba Cilwe "Book of Illumination", which claims to be the words of Tawûsê Melek, and which presumably represents Yazidi belief, states that he allocates responsibilities, blessings and misfortunes as he sees fit and that it is not for the race of Adam to question him. Sheikh Adî believed that the spirit of Tawûsê Melek is the same as his own, perhaps as a reincarnation. He is believed to have said:
Yazidi accounts of creation differ from that of Judaism, Christianity and Islam. They believe that God first created Tawûsê Melek from his own illumination (Ronahî) and the other six archangels were created later. God ordered Tawûsê Melek not to bow to other beings. Then God created the other archangels and ordered them to bring him dust (Ax) from the Earth (Erd) and build the body of Adam. Then God gave life to Adam from his own breath and instructed all archangels to bow to Adam. The archangels obeyed except for Tawûsê Melek. In answer to God, Tawûsê Melek replied, "How can I submit to another being! I am from your illumination while Adam is made of dust." Then God praised him and made him the leader of all angels and his deputy on the Earth. (This likely furthers what some see as a connection to the Islamic Shaytan, as according to the Quran he too refused to bow to Adam at God's command, though in this case it is seen as being a sign of Shaytan's sinful pride.) Hence the Yazidis believe that Tawûsê Melek is the representative of God on the face of the Earth, and comes down to the Earth on the first Wednesday of Nisan (April). Yazidis hold that God created Tawûsê Melek on this day, and celebrate it as New Year's Day. Yazidis argue that the order to bow to Adam was only a test for Tawûsê Melek, since if God commands anything then it must happen. (Bibe, dibe). In other words, God could have made him submit to Adam, but gave Tawûsê Melek the choice as a test. They believe that their respect and praise for Tawûsê Melek is a way to acknowledge his majestic and sublime nature. This idea is called "Knowledge of the Sublime" (Zanista Ciwaniyê). Şêx Adî has observed the story of Tawûsê Melek and believed in him.
Yazidis believe that good and evil both exist in the mind and spirit of human beings. It depends on the humans, themselves, as to which they choose. In this process, their devotion to Tawûsê Melek is essential, since it was he who was given the same choice between good and evil by God, and chose the good.
Outside views 
Some Christians, Muslims and others identify Tawûsê Melek as Lucifer or Satan. According to the Yazidi Black Book, the Yazidi are forbidden to say the name "Shaitan" because their people would be religiously persecuted by other faiths.
- Kjeilen, Tore. "Yazidism". Encyclopaedia. LookLex. Retrieved 2008-03-31. "Malak Taus filled 7 jars of tears through 7,000 years. His tears were used to extinguish the fire in hell. Therefore, there is no hell in Yazidism."
- Islam: Satan, sin, and repentance at Encyclopædia Britannica
- "Yezidi Reformer: Sheikh Adi". The Truth about the Yezidis. YezidiTruth.org, A Humanitarian Organization, Sedona, Arizona.