Sayyiduna Abu Bakr al-Siddiq (may Allah be pleased with him) narrates: The Prophet (peace and blessings be upon him) said: "There is no Muslim who performs ablution and does it well, then comes to the mosque and prays two rak'ahs in it, then seeks forgiveness from Allah Almighty, except that Allah Almighty forgives him." I say: Abu Dawud and others recorded this narration in abridged form, leaving out the coming to the mosque and praying in it.
Bazzar recorded it; its chain contains Abdullah bin Sa'id al-Maqburi, who is matruk (abandoned).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 2069