Musannaf Ibn Abi Shayba 3:4977

Ja'far ibn 'Awn narrated to us, from Mis'ar, from Habib ibn Abi Thabit, from Abu al-Duha, from Masruq, who said: The truthful one, daughter of the truthful one, narrated to me that the Messenger of Allah (may Allah bless him and grant him peace) never entered upon her after the afternoon prayer (Asr) without praying two rak'ahs.