Talhah bin Abdullah bin Awf states that Sayyiduna Ibn Abbas (may Allah be pleased with them both) led a funeral prayer and recited Surah al-Fatihah in it. I asked him about this, and he said that it is the Sunnah, or (he said) it is part of the completion of the Sunnah. This hadith is sahih (authentic) on the condition of both of them (Bukhari and Muslim), but they did not record it!