| Basic message of all Prophets
-Tawhid and Day of Judgment. Quran has confirmed that
the basic message of all the Prophets was the same. This shows that there has
been only one single religion, Islam, from the beginning. 
Those
to whom We have given the Book rejoice at what hath been revealed unto thee: but
there are among the clans those who reject a part thereof. Say: “I am commanded
to worship Allah, and not to join partners with Him. Unto Him do I call, and unto
Him is my return. (13:36) • Hazrat
Nooh(as) taught his nation about Tawhid and the Day of Judgment. 
“We
sent Nooh to his people(with a mission), I have come to you with a warning : that
you serve none but Allah. Verily I do fear for you the penalty of a grievous day.”
(11:26) • Prophet
Ibrahim (as) conveyed the message of Tauhid to his people. 
“And
Ibrahim said to his people: serve Allah and fear Him: that will be best for you
if you understand.” (29:16) •
Prophet Hud gave the
same message to his nation. 
“To
the Ad people (we sent) Hud, one of their brethren, He said: “ O my people!
worship Allah! you have no other god but Him”. (11:50) •
Hazrat Saleh reminded
the same message of Tawhid to his people. 
“To
the Thamud People (We sent) Salih, one of their own brethren. He said: “O
my people! Worship Allah: ye have no other god but Him. It is He Who hath produced
you from the earth and settled you therein: then ask forgiveness of Him, and turn
to Him (in repentance): for my Lord is (always) near, ready to answer.” (11:61) •
Hazrat Shu’ayb revised
the same lesson of Tawhid during his time. 
“To
the Madyan people (we sent) Shu’ayb, one of their brethen: he said: O my
people! worship Allah: You have no other god but Him.”(11:84) •
Hazrat Yusuf reminded
the same message of Tawhid. 
“I
don’t follow the ways of people who don’t believe in Allah and deny
the Day of Judgment. I follow the ways of my fathers - Ibrahim, Ishaq, and Yaqoob.
We must never serve any beside Allah.” (12:37,38) 
“The
command is for none but Allah: He has commanded that you worship none but Him:
that is the right religion, but most men don’t understand” (13:40) Hazrat
Musa was given the same message to deliver to his nation. “We gave Musa the
Book, and made it a guide to the children of Israel (commanding)”
Take
not other than Me as your Lord” 
“Allah!
there is no god but He - Lord of the throne supreme” (27:26) Thus, the core
content and the basic message of all Prophets was one and the same - Tawhid and
the Day of Judgment. This is also the fundamental message of the Holy Prophet
(sws) and the basic teaching of Islam. All Prophets have successfully completed
their mission of conveying this great message and no one from the nation of any
prophet can give any excuse of committing any kind of Shirk.
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