Musnad Ahmad 1153:1272

Yahya ibn Zakariyya narrated to us, he said: My father informed me, from Sa'd ibn Ibrahim, from a man of the Quraysh from the Banu Taym who is called Talhah, from Aisha, the Mother of the Believers, she said: The Messenger of Allah, may Allah bless him and grant him peace, reached for me, so I said: "I am fasting." He said: "And I am fasting."