Musnad Ahmad 658:15

'Affan narrated to us, Shu'bah narrated to us, he said: 'Alqamah ibn Marthad informed me, from Sa'd ibn 'Ubaydah, from al-Bara' ibn 'Azib, that the Prophet, peace and blessings of Allah be upon him, said regarding the grave: "When he is asked and he recognizes his Lord." He said: And he said something I do not memorize. That is His saying, the Almighty and Majestic: {Allah keeps firm those who believe, with the firm word, in the worldly life and in the Hereafter} [Ibrahim: 27].