A--- The proof of this from the Glorious Qur'an and the Prophetic Sunnah is of two types: (a) summarized and (b) detailed.

As for the summarized: Almighty Allah says: {And verily, We have sent among every Ummah (community, nation) a Messenger (proclaiming): "Worship Allah (Alone), and avoid (or keep away from) Taghut (all false deities i.e. do not worship Taghut besides Allah)"}. (An-Nahl, 36)

Allah the Almighty says: {And We did not send any Messenger before you (O Muhammad (Peace be upon him)) but We revealed to him (saying): "La ilaha illa Ana [none has the right to be worshipped but I (Allah)], so worship Me (Alone and none else)

"}. (Al-Anbiya', 25)

Allah the Almighty says: {And ask (O Muhammad (Peace be upon him)) those of Our Messengers whom We sent before you: "Did We ever appoint alihah (gods) to be worshipped besides the Most Gracious (Allah)?"). (Az-Zukhruf, 45) As for the detailed: Almighty Allah says: {And indeed We sent Nuh (Noah) to his people, and he said: "O my people! Worship Allah! You have no other Ilah (god) but Him (Islamic Monotheism)}. (AlMu'minun, 23)

Allah the Almighty says: {And to Thamud (people, We sent) their brother Salih. He said: "O my people! Worship Allah! You have no other Ilah (god) but Him"}. (Al-A'raf, 73)

Allah the Almighty says: {And to 'Ad (people, We sent) their brother Hud. He said: "O my people! Worship Allah! You have no other Ilah (god) but Him"}. (Al-A'raf, 65 & Hud, 50)

Allah the Almighty says: {And to (the people of) Madyan (Midian), (We sent) their brother Shu 'aib. He said: "O my people! Worship Allah! You have no other llah (god) but Him"}. (Al-A'raf, 85 & Hud, 84)

Allah the Almighty says: {And (remember) when Ibrahim (Abraham) said to his father and his people: "Verily, I am innocent of what you worship. Except Him (i.e. Allah Alone I worship none) Who did create me; and verily He will guide me"}.

(Az-Zukhruf, 26, 27)

Allah the Almighty says: {Your ilah (god) is only Allah (the One) La ilaha ilia Huwa (none has the right to be Worshipped but He), He has full knowledge of all things}. (Ta-Ha, 98)

Allah the Almighty says: {But the Messiah [' Isa (Jesus)] said: "O Children of Israel! Worship Allah, my Lord and your Lord." Verily, whosoever sets up partners (in worship) with Allah, then Allah has forbidden Paradise to him, and the Fire will be his abode}. (AlMa'idah, 72)

Allah the Almighty says: {Say (O Muhammad (Peace be upon him)):

"I am only a warner and there is no Ilah (god) except Allah (none has the right to be worshipped but Allah) the One, the Irresistible "}. (Sad, 65)