Bishr bin Hayyan narrates: Sayyiduna Wathilah bin al-Asqa' (may Allah be pleased with him) came while we were building our mosque. He stopped by us and greeted us with salam, then he said: I heard the Prophet (peace and blessings be upon him) saying: "Whoever builds a mosque and prays in it, Allah Almighty builds for him in Paradise a house more excellent than it."
Imam Ahmad and Imam al-Tabarani in al-Mu'jam al-Kabir recorded it; its chain contains a narrator, al-Hasan bin Yahya al-Khushani. Imam al-Daraqutni (may Allah have mercy on him), and Yahya bin Ma'in according to one report, declared him da'if (weak); according to another report Yahya declared him thiqah (trustworthy), and Duhaym and Abu Hatim declared him thiqah.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 1936