Allah Subhanoho wa-T'ala Says to Prophet Muhammad (s.a.a.w.) in The Holy Quran:
وَمَا أَرْسَلْنَاكَ إِلَّا رَحْمَةً لِّلْعَالَمِين
"And We have not sent you except as a mercy to mankind." (The Prophets 21:107)
Hadrat Abu Huraira (may Allah be pleased with him) said: the Prophet (may Allah's blessings and peace be upon him) was asked to curse the infidels. He said, "I have not been sent to curse people but as a mercy to all mankind." (Muslim)
Mother of faithful believers Hadrat Aisha (may Allah be pleased with her) said that she once asked the Holy Prophet (may Allah's blessings and peace be upon him):
'Did you face a day severer than the day of the battle of Uhud? '
'Yes I have experienced such things at the hands of your people and such a day was the day of Aqabah. On this day I presented myself to Abdi lail bin Abd Kulal and offered him Islam, but he failed to make any response to what I had offered to him.
I therefore, left with a heavy heart and depressed. I felt some relief only when I reached Qarn Sa'alib. Here I looked up and saw a cloud covering me. In this cloud I saw Angel Jibrail (peace be upon him) who called me and said:
Allah, the Most High, has heard what your people have said to you and the response to your offer. Allah has now sent the Angel of the Mountains to you to carry out your orders to do what you might like to be done to them.
Then the Angel of the Mountains addressed me greeting with Salam and then said:
'Muhammad! Allah (The Glorified and the Exalted) has heard what your people have said to you. I am the Angel of the Mountains and my Lord has sent me to you to carry out your orders. What do you want now to be done? If you like I may crush them between the two mountains encircling the city of Makka.'
The Holy Prophet (may Allah's blessings and peace be upon him) replied:
(I do not want their destruction) I am still hopeful that Allah will make some of their children (good Muslims) who would worship Allah, the One, without associating anybody with Him. (Bukhari and Muslim).
Related Link: Life of Muhammad