The Messenger of Allah ﷺ said, "Whoever sets out and comes to this mosque, the mosque of Quba, and prays in it, will have a reward equal to that of an Amra."
قال رسول الله ﷺ: من خرج حتى يأتي هذا المسجد مسجد قباء، فصلى فيه كان له عدل عمرة.
Nasai (699) narrated it from Qutayba, who said, Mujammi bin Yaqub narrated to us, from Muhammad bin Sulayman Kirmani, who said, I heard Abu Umama bin Sahl bin Hunayf say, My father said, and he mentioned it. Ibn Majah (1412) narrated it through another route from Muhammad bin Sulayman Kirmani, with this wording, "Whoever purifies himself in his house, then comes to Masjid Quba and prays a prayer in it, will have a reward like that of an umrah." Its isnad is hasan because of Muhammad bin Sulayman Kirmani Qubai, whom Ibn Hibban mentioned in his Thiqat (7/372), and a large number of narrators transmitted from him, though I did not find anyone who explicitly declared him trustworthy. The transmission of a large number of narrators removes from him the status of being an unidentified narrator, and one feels at ease accepting his narration, since he did not bring any objectionable report. Dhahabi said of him, "He was deemed trustworthy." He was corroborated by Ubayd bin Mihsan Azdi and Uqba bin Maysara Abu Ismail and others, and he has other chains of transmission, the one I have mentioned being the best of them. That is why Hakim said in Mustadrak (123), "This is a hadith sahih in isnad, though the two of them did not include it."On this subject there are hadiths from Usayd bin Zuhayr Ansari, Ibn Umar, Kaab bin Ujra, Zuhayr bin Rafi Harithi Awsi, Anas bin Malik, Umar bin Khattab, Saad bin Abu Waqqas, and others, though none of them are free from a daif or unidentified narrator, or from being a stopped narration or a disconnected one, even though some scholars use some of them as corroborating evidence.