Musnad Ahmad 1153:1419

Muhammad ibn Ja'far narrated to us, he said: Shu'bah narrated to us, from Abu Ishaq, from al-Aswad and Masruq, that they both said: We bear witness regarding 'Aishah, that she said: "There was no day of his that he spent with me, except that the Messenger of Allah (ﷺ) prayed them in my house." She meant: the two rak'ahs after the 'Asr prayer.