Musnad Ahmad 937:56

Hassan ibn Musa narrated to us, Zuhayr narrated to us, from Mansur, from Rib'i ibn Hirash—Mansur said: from Zayd ibn Dhubyan, or from a man, from Abu Dharr—who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "I was given the concluding verses of Surat al-Baqarah from a treasure house beneath the Throne; no prophet before me was given them."