Back 
Surah 21. Al-Anbiya
Ayah 107 - 111
107وَمَآ أَرْسَلْنَـٰكَ إِلَّا رَحْمَةً لِّلْعَـٰلَمِينَ
108قُلْ إِنَّمَا يُوحَىٰٓ إِلَىَّ أَنَّمَآ إِلَـٰهُكُمْ إِلَـٰهٌ وَٰحِدٌ ۖ فَهَلْ أَنتُم مُّسْلِمُونَ
109فَإِن تَوَلَّوْا۟ فَقُلْ ءَاذَنتُكُمْ عَلَىٰ سَوَآءٍ ۖ وَإِنْ أَدْرِىٓ أَقَرِيبٌ أَم بَعِيدٌ مَّا تُوعَدُونَ
110إِنَّهُۥ يَعْلَمُ ٱلْجَهْرَ مِنَ ٱلْقَوْلِ وَيَعْلَمُ مَا تَكْتُمُونَ
111وَإِنْ أَدْرِى لَعَلَّهُۥ فِتْنَةٌ لَّكُمْ وَمَتَـٰعٌ إِلَىٰ حِينٍ
[107-111] O Muhammad! We have sent you to be a real blessing for the people of the world.100 Say to them, "That which is revealed to me is this: Your Deity is One Deity only. Will you, then, surrender to Him?" If even then, they turn away from it, tell them plainly, "I have warned you openly; now I do not know whether that thing with which you are being threatened101 is near at hand or far off. You should, however, note it well that) Allah has the knowledge of what is uttered aloud and also of what you talk about secretly.102 I think that this (delay) may be a trial for you,103 and you are being given respite to enjoy yourselves for an appointed term."
100This verse (107) can also be translated as: "We have sent you only as a blessing for the people of the world". In both cases it will mean that the appointment of the Holy Prophet is indeed a blessing and mercy of Allah to the whole world. This is because he aroused the neglectful world froth its heedlessness and gave it the knowledge of the criterion between truth and falsehood, and warned it very clearly of both the ways of salvation and. ruin. This fact has been stated here 'to tell the disbelievers of Makkah that they were quite wrong in their estimate of the Holy Prophet that he was an affliction and distress for them because they said, "This man has sown seeds of discard among our clans and separated near relatives from each other." They have been told here, "O foolish people, you are wrong to presume that he is an affliction for you; but he is in reality a blessing and mercy of Allah for you."
101That is, "I do not know the time and the form of the punishment of Allah for your rejection of the Message. It tray come at any time in any shape."
102This refers to their secret schemes, plots and their whispering campaign which have been mentioned in v. 3. There, too, the Prophet had said, "My Lord has the knowledge of everything that is said in the heavens or the earth for He is All-Hearing, All-Knowing". (v. 4). This was to warn them that they would be taken to task for these things, too.
103This was a "trial" because the delay in the "punishment" was deluding them into believing "All the things put forward by the Prophet are false: had he been a true Prophet of Allah we would have been punished long before this for our disbelief." They did not realize that the reason for the delay was that Allah willed to give them respite for mending their ways.