Ibn Buraydah narrates from his father (Sayyiduna Buraydah (may Allah be pleased with him)) that the Messenger of Allah (peace and blessings be upon him) said: "Before I leave the mosque, I will tell you of a surah or a verse that has not been revealed to anyone after Sulayman (peace be upon him) except me." He said: He (peace and blessings be upon him) walked and I followed behind him. He (peace and blessings be upon him) reached the door of the mosque. He said: He (peace and blessings be upon him) put one foot out over the threshold while the other was in the mosque. I said within myself: He (peace and blessings be upon him) has forgotten. He (peace and blessings be upon him) turned towards me and said: "When you begin the prayer, with what part of the Qur'an do you begin your recitation?" I said: With "In the name of Allah, the Most Gracious, the Most Merciful" [Surah al-Fatihah: 1]. He (peace and blessings be upon him) said: "Yes, this is it." Then he (peace and blessings be upon him) went out.
Its chain is weak.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الأيمان / 20023