Q 90: What is the textual proof that they call for the same principle of worship (mentioned earlier)?
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)}. ()