Do not undertake a journey to visit any Mosque, but three: this Mosque of mine, the Mosque of al-Haram and the Mosque of Aqsa (Bait al-Maqdis).
Sahih Muslim Book 15, Hadith 588
← Previous Hadith In case Allah cures me I will certainly go and observe prayer in Bait al-Maqdis. She recovered and so she made preparations to go out (to that place). She came to Maimuna. the wife of Allah's Apostle (ﷺ). and after greeting her she informed her about it, whereupon she said: Stay here. and eat the provision (which you had made) and observe prayer In the mosque of the Messenger (ﷺ). for I heard Allah's Messenger (ﷺ) say: Prayer In it is better than a thousand prayers observed in other mosques except the mosque of the Ka'ba.

Sahih Muslim Book 15, Hadith 587 Next Hadith → " Undertake journey to three mosques."

Sahih Muslim Book 15, Hadith 589