Praise be to Allah. Peace and blessings be upon the Messenger of Allah, his family, Companions, and whoever has followed his guidance.
Allah (May He be Exalted and Glorified) sent His messengers (peace be upon them) to call to AlHaqq (Truth) and guide people. They were sent as givers of glad tidings and warners, so that people can never have a plea against Allah after the Messengers, who conveyed the Message, fulfilled the trust, sincerely advised their nations, endured the harm, and truly strived in the cause of Allah until He established the proof and blocked the way to excuses for them.
And verily, We have sent among every Ummah (community, nation) a Messenger (proclaiming): "Worship Allâh (Alone), and avoid (or keep away from) Tâghût (all false deities i.e. do not worship Tâghût besides Allâh)." Then of them were some whom Allâh guided and of them were some upon whom the straying was justified. So travel through the land and see what was the end of those who denied (the truth).
And We did not send any Messenger before you (O Muhammad ﺻﻠﻰ ﺍﷲ ﻋﻠﻴـﻪ ﻭﺳـﻠﻢ) but We revealed to him (saying): Lâ ilâha illa Ana [none has the right to be worshipped but I (Allâh)], so worship Me (Alone and none else).
And ask (O Muhammad ﺻﻠﻰ ﺍﷲ ﻋﻠﻴﻪ ﻭ ﺳﻠﻢ) those of Our Messengers whom We sent before you: "Did We ever appoint âlihâh (gods) to be worshipped besides the Most Gracious (Allâh)?"
Thus, Allah (Glorified be He) clarified in these Ayahs that He had sent the messengers to call people to worship Allah alone, and to warn them against associating others in worship with Him.
The messengers (peace be upon them) conveyed the Message and called their people to single out Allah in worship. Accordingly, they had founded the basis of equity, virtuousness, and peace. They had excellently succeeded in their mission, for their mission was to convey and declare the Divine Truth. Whereas the guidance of hearts and the direction toward acceptance of Truth comes from Allah, not from messengers or any other person.
And they make the angels who themselves are slaves of the Most Gracious (Allâh) females. Did they witness their creation? Their testimony will be recorded, and they will be questioned! And they said: "If it had been the Will of the Most Gracious (Allâh), we should not have worshipped them (false deities)." They have no knowledge whatsoever of that. They do nothing but lie!
Or have We given them any Book before this (the Qur'ân) to which they are holding fast? Nay! They say: "We found our fathers following a certain way and religion, and we guide ourselves by their footsteps."
And similarly, We sent not a warner before you (O Muhammad ﺻﻠﻰ ﺍﷲ ﻋﻠﻴﻪ ﻭ ﺳﻠﻢ) to any town (people) but the luxurious ones among them said: "We found our fathers following a certain way and religion, and we will indeed follow their footsteps." (The warner) said: "Even if I bring you better guidance than that which you found your fathers following?" They said: "Verily, we disbelieve in that with which you have been sent." So We took revenge on them, then see what was the end of those who denied (Islâmic Monotheism).