Mishkat al-Masabih #1571
Funerals
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ طَلْحَةَ بْنِ عَبْدِ اللَّهِ بْنِ عَوْفٍ قَالَ: صَلَّيْتُ خَلْفَ ابْنِ عَبَّاسٍ عَلَى جَنَازَةٍ فَقَرَأَ فَاتِحَةَ الْكِتَابِ فَقَالَ: لِتَعْلَمُوا أَنَّهَا سُنَّةٌ. رَوَاهُ البُخَارِيّ
Talha b. ‘Abdallah b. ‘Auf said he prayed behind Ibn ‘Abbas at a funeral and he recited Fatihat al-Kltab (Qur'an, sura i). He then said that it was to let them know it was a sunna.
Bukhari transmitted it.
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About Mishkat al-Masabih
This hadith is #1571 from Mishkat al-Masabih, in the Book of Funerals.