Not graded
Bulugh al-Maram 564
وَعَنْ طَلْحَةَ بْنِ عَبْدِ اَللَّهِ بْنِ عَوْفٍ قَالَ: { صَلَّيْتُ خَلَفَ ابْنِ عَبَّاسٍ عَلَى جَنَازَةٍ, فَقَرَأَ فَاتِحَةَ الكْتِابِ فَقَالَ:
"لِتَعْلَمُوا أَنَّهَا سُنَّةٌ"
Talhah bin ‘AbduIlah bin ‘Auf (RAA) narrated, ‘I offered a funeral prayer led by Ibn ‘Abbas. He recited al-Fatihah and said, ‘You should know that it (reciting al-Fatihah) is a Sunnah of the Prophet (ﷺ).’ Related by Al-Bukhari.
Cited in Bulugh al-Maram (No. 564).