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)Read more...
Allah T'ala says in the Holy Quran:
إَنَّ الَّذِينَ لاَ يَرْجُونَ لِقَاءنَا وَرَضُواْ بِالْحَياةِ الدُّنْيَا وَاطْمَأَنُّواْ بِهَا وَالَّذِينَ هُمْ عَنْ آيَاتِنَا غَافِلُونَ
أُوْلَـئِكَ مَأْوَاهُمُ النُّارُ بِمَا كَانُواْ يَكْسِبُونَ
Surely those who do not expect to meet Us, who are gratified with the life of the world and content with it, and are heedless of Our signs,their abode shall be the Fire in return for their misdeeds. (The Holy Quran, 10:7-8)
The statement that is being made here is that rejection of the doctrine of the Hereafter necessarily entails the punishment of Hell, and the argument that is being proffered in support of it is that those who are oblivious to the Hereafter commit, because of their disbelief in it, evil deeds which can only lead to them suffering the torments of Hell. This argument is corroborated by the entire record of man's past. It is quite clear that the lives of those who do not believe that they will not be held to account by God for their deeds; who work on the assumption that life is merely confined to the span of worldly existence; who measure human success or failure only in terms of the extent of material comfort, fame and power that a person is able to enjoy; who under the influence of such materialistic notions do not even care to pay attention to those signs of God which point to reality, assume an altogether wrong direction with the result that their life is vitiated. Hence they live a totally unbridled life, develop the worst possible character traits, and fill God's earth with injustice and corruption, with sin and transgression, and ultimately end up meriting the punishment of Hell.
Some of the Prophet’s Companions were given to see this light as even brighter than both the sun and moon, for when they walked with him they noticed that he cast no shadow on the ground.[10. al-Hakim al-Tirmidhi] Those who saw him in the full moon noticed that his blessed face was brighter than the moon,[11. Tirmidhi] and one of his Companions, the Lady Rubayyi‘, when asked to describe him, said, "My son, had you seen him, you would have seen the sun shining."[12. Tirmidhi]
The light of the Prophet shone at all levels, it filled the material, intermediary, and spiritual worlds, dispelled the darkness of ignorance and disbelief, and is destined to shine across the ages till the end of time.
That this light was physical as well as spiritual was borne witness to most amply by those who saw him. The Lady ‘A‘isha related how she saw the whole room fill with light one night, then it disappeared, while the Prophet continued to call upon his Lord. Then the room was filled with a more powerful light which disappeared after a while. She asked, "What is this light I saw?" he said, "Did you see it. O ‘A‘isha?" "Yes!" she replied. He said, "I asked my Lord to grant me my nation, so He gave me one third of them, so I praised and thanked Him. Then I asked him for the rest, so He gave me the second third, so I praised and thanked Him. Then I asked Him for the third third, so He gave it to me, so I praised and thanked Him." She said that had she wished to pick up mustard seeds from the floor by this light she could have.[13. Abu Nu'aym in Hilia.] In the famous description of Hind ibn Abi Hala, the Prophet’s stepson from the Lady Khadija, "He was dignified and awe inspiring, radiant like the radiance of the moon on the night it is full…"[14. Tirmidhi in Shama'il, Bayhaqi, Tabarani, and ibn Sa'd.] Ibn ‘Abbas described how he saw light shining from between his front teeth.[15. Tirmidhi in Shama'il, Darimi, Bayhaqi, Tabarani, and ibn Asakir.] Abu Qursafa, as a boy, went to swear allegiance to the Prophet, together with his mother and her sister. When they returned home they told him, " My son, we have never seen the like of this man, nor anyone better looking, cleaner dressed, or gentler in his speech; and we saw as if light came out of his mouth." [16. Tabarani.]