Musnad Ahmad 1153:594

Qutaybah ibn Sa'id narrated to us, he said: Ibn Lahi'ah narrated to us, from Usamah ibn Zayd, from Safwan ibn Sulaym, from 'Urwah ibn al-Zubayr, from 'Aishah, she said: The Messenger of Allah, peace and blessings of Allah be upon him, said: "The blessing of a woman is the ease of her engagement, and the ease of her dowry."