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Surah 38. Sad
Ayah 86 - 88
86 قُلْ مَآ أَسْـَٔلُكُمْ عَلَيْهِ مِنْ أَجْرٍ وَمَآ أَنَا۠ مِنَ ٱلْمُتَكَلِّفِينَ
87 إِنْ هُوَ إِلَّا ذِكْرٌ لِّلْعَـٰلَمِينَ
88 وَلَتَعْلَمُنَّ نَبَأَهُۥ بَعْدَ حِينٍۭ
[86-88] (O Prophet,) say to them, "I do not ask any recompense of you for this message,71 nor am I an impostor.72 This is only an admonition for all the people of the world, and after a while you shall yourself come to know all about it."73
71That is, "I am a selfless person: I have no vested interest in preaching this message."
72That is, "I am not one of those who arise with false claims for the sake of vanity and pose to be what actually they are not. " The Holy Prophet has not been made to say this merely for the information of the disbelievers of Makkah but this is testified by his whole life which he lived among the same people for forty years before his advent as a Prophet. Every child of Makkah was a witness that Muhammad (upon whom be Allah's peace) was not an impostor. Never had anybody from among the people of Makkah ever heard anything from him, which might have caused somebody the doubt that he aspired to be a great man and was planning and scheming for that end.
73That is, Those of you who live will see for themselves within a few years that what I am saying is fulfilled; those who die will come to know as soon as they pass through the gate of death that the truth is the same which I am preaching.