Reciting al-Fatihah in the funeral prayer

Talhah bin Abdullah bin Awf narrates: I prayed a funeral prayer behind Sayyiduna Ibn Abbas (may Allah be pleased with them both) and heard him reciting Surah al-Fatihah. When he finished, I took hold of his hand and asked: "Did you recite (al-Fatihah)?" He replied: "Yes, it is a truth and a Sunnah."
It also has a detailed supporting narration (shahid) reported through Ibrahim bin Abi Yahya:

Sayyiduna Jabir (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) used to say four takbirs over our funerals and recite Surah al-Fatihah in the first takbir.