Musnad Ahmad 1163:31

Hajjaj narrated to us, he said: Al-Layth—meaning Ibn Sa’d—narrated to us, he said: Nafi’ narrated to us, from Ibrahim ibn Abdullah ibn Ma’bad ibn Abbas, that he said: A woman suffered an ailment, so she said: "If Allah heals me, I will surely go out and pray in Bayt al-Maqdis (Jerusalem)." She recovered, so she prepared herself, intending to go out. Maymunah, the wife of the Prophet, may Allah bless him and grant him peace, came to greet her, and she informed her of that. She said: "Sit down, eat what you have prepared, and pray in the Mosque of the Messenger, may Allah bless him and grant him peace, for I heard the Messenger of Allah, may Allah bless him and grant him peace, say: 'A prayer in it is better than a thousand prayers in any other mosque, except for the Mosque of the Ka'bah.'"