Musnad Ahmad 1153:1060

Waki' narrated to us, my father narrated to us, from Sa'id ibn Masruq, from Aban ibn Salih, from Umm Hakim, from Aisha, who said: "I performed a prayer that I used to perform during the time of the Prophet, peace and blessings of Allah be upon him. If my father were resurrected, and he forbade me from it, I would not have abandoned it."