Musannaf Ibn Abi Shayba 3:616

A'idh ibn Habib narrated to us, from Yahya ibn Sa'id, from al-Qasim ibn Muhammad, who said: I saw 'A'ishah counting with her hand, saying: "The greetings, the pure things, the prayers, the sanctified things are for Allah. Peace be upon the Prophet and the mercy of Allah. Peace be upon us and upon the righteous servants of Allah. I bear witness that there is no god but Allah, and I bear witness that Muhammad is His servant and His messenger." He said: Then she would supplicate for herself with whatever occurred to her.