Musnad Ahmad 920:20

'Abdullah narrated to us, Yahya bin 'Abdullah, the freed slave of Banu Hashim, narrated to us, Muhammad bin Aban al-Ju'fi narrated to us, from Abu Ishaq, from Sa'id bin Jubayr, from Ibn 'Abbas, from Ubayy bin Ka'b, from the Prophet, peace and blessings of Allah be upon him, regarding the saying of the Blessed and Exalted: "And remind them of the days of Allah" [Ibrahim: 5]. He said: "The blessings of Allah."