Musnad Ahmad 27:59

Isma'il narrated to us, Ayyub informed us, from Nafi', from Ibn 'Umar, who said: "I prayed with the Prophet, peace and blessings of Allah be upon him, two rak'ahs before Dhuhr, and two rak'ahs after it, and two rak'ahs after Maghrib in his house, and two rak'ahs after 'Isha in his house." He said: And Hafsa narrated to me: "That he used to pray two rak'ahs when the dawn broke and the caller called for prayer—Ayyub said: I think he said: 'light ones'—and two rak'ahs after Jumu'ah in his house."