"And verily, We have sent among every Ummuh (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)."
(Qur'an: Translation of the meaning, 16:36)

Ever since people innovated the dogmas of shirk, (i.e. joining others in worship along with Allah), Allah had been sending prophets and messengers to His slaves in order to invite them to the worship of Allah and Allah Alone, to order them not to ascribe partners unto Him and bring them out of the darkness of polytheism into the light of Monotheism, All the prophets preached Tauhid (i.e. monotheism, the belief in the Oneness of Allah, the Glorious, the Exalted).

"Indeed We sent Nuh (Noah) to his people, and he said: "O my people! Worship Allah! You have no other ilah (god) but Him. (La ilaha illallah, none has the right to be worshipped but Allah). Certainly. I fear for you the torment of a great Day!"
(Qur'an: Translation of the meaning, 7:59).

"And to ŒAd (people, We sent) their brother Hud. He said "O my people! Worship Allah! You have no other ilah (god) but Him. (La ilaha illallah, none has the right to be worshipped but Allah). Will you not fear (Allah)?"
(Qur'an: Translation of the meaning, 7:65)

"And to (the people of) Madyan (Midian). (We sent) their brother Shu'aib. He said: "O my people! Worship Allah! You have no other ilah (god) but Him. (La Ilaha illallah, none has the right to be worshipped but Allah). Verily, a clear proof (sign) from your Lord has come unto you, so give full measure and full weight and wrong not men in their things, and do not make mischief on the earth after it has been set in order, that will be better for you, if you are believers."
(Qur'an: Translation of the meaning, 7:85)

"And to Thamud (people, We sent) their brother Salih, He said: "O my people! Worship Allah! You have no other ilah (god) but Him. (La ilaha illallah, none has the right to be worshipped but Allah)."
(Qur'an: Translation of the meaning, 7:73)

Every prophet was sent to his own nation for their guidance, but the Message of Prophet Muhammad ( was general for all mankind and jinn. As in surat Al-A'raf (Allah addresses His Messenger):

"Say (O Muhammad): O mankind: Verily, I am sent to you all as the Messenger of Allah"
(Qur'an: Translation of the meaning, 7:158).

So the aim of sending these prophets and messengers (peace be upon them all) to men and jinn was only that they should worship Allah Alone.

"And I (Allah) created not the jinns and men except they should worship Me (Alone)"
(Qur'an: Translation of the meaning, 51:56)

Then those who will obey Allah will be rewarded in Paradise, and those who will disobey Him will be punished in the Hell-fire.