Musnad Ahmad 1153:2148

Mus'ab ibn al-Miqdam narrated to us, he said: Isra'il narrated to us, from al-Miqdam ibn Shurayh, from his father, he said: I asked 'Aishah about the prayer of the Messenger of Allah, may Allah bless him and grant him peace, how he used to pray? She said: "He used to pray the *Hajir* (midday prayer), then he would pray two rak'ahs after it."