Musannaf Ibn Abi Shayba 3:5161

Yahya ibn Ya'la narrated to us, from 'Abd al-Malik ibn 'Umayr, from Qaza'ah, from Abu Sa'id, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "Do not undertake a journey except to three mosques: The Sacred Mosque, this mosque of mine, and the Al-Aqsa Mosque."