Surah Hud made the Prophet's Hair turn Gray

Abu `Isa At-Tirmidhi recorded from Ibn `Abbas that Abu Bakr said, "O Messenger of Allah, verily your hair has turned gray.'' The Prophet replied,

«شَيَّبَتْنِي هُودٌ وَالْوَاقِعَةُ وَالْمُرْسَلَاتُ وَعَمَّ يَتَسَاءَلُونَ وَإِذَا الشَّمْسُ كُوِّرَت»

(Surahs Hud, Al-Waqi`ah, Al-Mursalat, `Amma Yatasa'lun ﴿An-Naba'﴾ and Idhash-Shamsu Kuwwirat ﴿At-Takwir﴾ have turned my hair gray.) In another narration he said,

«هُودٌ وَأَخَوَاتُهَا»

(Surah Hud and its sisters...)

﴿بِسْمِ اللَّهِ الرَّحْمَـنِ الرَّحِيمِ ﴾

In the Name of Allah, the Most Gracious, the Most Merciful.

﴿الر كِتَابٌ أُحْكِمَتْ ءايَـتُهُ ثُمَّ فُصِّلَتْ مِن لَّدُنْ حَكِيمٍ خَبِيرٍ - أَلاَّ تَعْبُدُواْ إِلاَّ اللَّهَ إِنَّنِى لَكُمْ مِّنْهُ نَذِيرٌ وَبَشِيرٌ - وَأَنِ اسْتَغْفِرُواْ رَبَّكُمْ ثُمَّ تُوبُواْ إِلَيْهِ يُمَتِّعْكُمْ مَّتَاعًا حَسَنًا إِلَى أَجَلٍ مُّسَمًّى وَيُؤْتِ كُلَّ ذِي فَضْلٍ فَضْلَهُ وَإِن تَوَلَّوْاْ فَإِنِّي أَخَافُ عَلَيْكُمْ عَذَابَ يَوْمٍ كَبِيرٍ - إِلَى اللَّهِ مَرْجِعُكُمْ وَهُوَ عَلَى كُلِّ شَىْءٍ قَدِيرٌ ﴾

(1. Alif Lam Ra. (This is) a Book, the Ayat whereof are perfect (in every sphere of knowledge), and then explained in detail from One (Allah), Who is All-Wise Well-Acquainted (with all things).) (2. (Saying) worship none but Allah. Verily, I (Muhammad) am unto you from Him a warner and a bringer of glad tidings.) (3. And (commanding you): "Seek the forgiveness of your Lord, and turn to Him in repentance, that He may grant you good enjoyment, for a term appointed, and bestow His abounding grace to every owner of grace. But if you turn away, then I fear for you the torment of a Great Day.) (4. To Allah is your return, and He is able to do all things.'')