From Tafsir Ibn Kathir for Surat-Hud
Abu `Isa At-Tirmidhi recorded from Ibn `Abbas that Abu Bakr said, “O Messenger of Allah, verily your hair has turned gray.” The Prophet [sallahAllahu ‘alayhi wa sallam] replied, “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, “Surah Hud and its sisters…”
*********From “An Introduction to the Science of Hadith” by Dr. Suhaib Hasan:
According to Ibn Kathir, if reporters disagree about a particular shaikh, or about some other points in the isnad or the text, in such a way that none of the opinions can be preferred over the others, and thus there is uncertainty about the isnad or text, such a hadith is called mudtarib (shaky).
For example, with regard to idtirab in the isnad, it is reported on the authority of Abu Bakr that he said, “O Messenger of Allah! I see you getting older?” He (sallahAllahu ‘alayhi wa sallam) is reported to have replied, “What made me old are Surah Hud and its sister surahs.” Al-Daraqutni says, (more…)