Sayyiduna Abu Ubaydah bin al-Jarrah (may Allah be pleased with him) narrates: The Prophet (peace and blessings be upon him) said: "No prayer has more excellence than offering the Fajr prayer in congregation on the day of Friday, and I consider that whoever among you attends it will be forgiven."
Al-Bazzar and al-Tabarani recorded it in al-Mu'jam al-Kabir and al-Mu'jam al-Awsat; all of them recorded it from Ubaydullah bin Zahr, from Ali bin Yazid, and both of them are da'if (weak).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 3020