Musnad Ahmad 937:274

Hajjaj narrated to us, Shaiban narrated to us, Mansur narrated to us, from Rib'i, from Kharasha ibn al-Hurr, from al-Ma'rur, from Abu Dharr, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "I have been given the concluding verses of Surat al-Baqarah from a treasure beneath the Throne, and no prophet before me was given them."