Musnad Abu Ya'la al-Mawsili 107:2

Zuhayr ibn Harb narrated to us, Jarir narrated to us, from Muhammad ibn Ishaq, from Yazid ibn Abi Habib, from Marthad ibn Abdullah, from Uqbah ibn Amir, who said: I heard the Messenger of Allah, may Allah bless him and grant him peace, saying: "Recite these two verses from the end of Surat al-Baqarah, for I have been given them from beneath the Throne."