It is narrated from Sayyiduna Abu Umamah and Sayyiduna Utbah bin Abd (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) used to say: "Whoever prays the Fajr prayer in congregation in a mosque, then remains seated until he offers the tasbih (prayer) of Duha, will have a reward like that of one who performs a complete Hajj and Umrah."
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7618