Musnad Abu Ya'la al-Mawsili 150:221

'Abd al-A'la narrated to us, Khalid narrated to us, from al-Mughirah, from Umm Musa, who said: Najiyah bint Qarazah sent me to 'A'ishah to ask her about the prayer after the 'Asr [prayer]. She said: So I came to her, and I did not care what she said after what I had seen from 'Ali. She said: So she informed me that the Messenger of Allah, may Allah bless him and grant him peace, used to pray after the 'Asr.