He came to the Prophet ﷺ, who asked him, "What is your name?"He replied, "Hazn."The Prophet ﷺ said, "You are Sahl."He answered, "I will not change a name my father gave me."Ibn al-Musayyab said, "Roughness has remained among us ever since."Ali bin Abdullah and Mahmud, who is Ibn Ghaylan, narrated to us, both saying, Abdul-Razzaq narrated to us, Muamar reported to us, from Zuhri, from Ibn al-Musayyab, from his father, from his grandfather, with this same narration.
حدثنا إسحاق بن نصر حدثنا عبد الرزاق أخبرنا معمر عن الزهري
جاء إلى النبي ﷺ فقال ما اسمك قال حزن قال أنت سهل قال لا أغير اسما سمانيه أبي قال ابن المسيب فما زالت الحزونة فينا بعد حدثنا علي بن عبد الله ومحمود هو ابن غيلان قالا حدثنا عبد الرزاق أخبرنا معمر عن الزهري عن ابن المسيب عن أبيه عن جده بهذا
Bukhari reported the hadith of Mamar, from Zuhri, from Saeed bin Musayab, from his father, from his grandfather, "What is your name?" He said, "Hazn." He also reported it from the hadith of Ibn Jurayj, from Abdul-Hameed bin Jubayr, from Saeed, that his grandfather was Hazn. This is mursal. Qatada and Ali bin Zayd said the same, from Ibn Musayab.
Al-Hafiz said, on page 576, "This is how Saeed narrated the hadith as a mursal report when he related it from Abdul-Hameed, but when Zuhri related it, he connected it from his father, as was explained previously in the chapter before this one. This follows Shafii's principle that when a mursal report is found connected through another route, the soundness of the mursal's source becomes established. It also follows Bukhari's principle that a difference between a connected and a disconnected narration does not undermine the connected version in favor of the disconnected one, when the one who connected it has a stronger memory than the one who left it disconnected, as is the case here, since Zuhri has a stronger memory than Abdul-Hameed."Al-Hafiz also said in the introduction, page 379 of the Turkish printing, after citing Daraqutni's statement, "I say, this follows what we established earlier, that Bukhari relies on this wording when it is accompanied by an indication suggesting connection, especially since Zuhri connected it explicitly. So he presented both versions as possibilities, and Allah knows best. Abdul-Razzaq narrated it from Ibn Jurayj, and in it he also said 'from his father, from his grandfather.' Ismaili related this through his route."