(4) Prayer
كتاب الصلاة
(19b) Chapter: Making Mention of God after the Prayer - Section 2
(18) باب الذكر بعد الصلاة - الفصل الثاني
Mishkat al-Masabih 971 
He reported God’s Messenger as saying, “If anyone, prays the dawn prayer in a company, then sits making mention of God till the sun rises, then prays two rak'as, he will have a reward equivalent to that for a hajja* and an ‘umra.” He reported God’s Messenger as adding, “A perfect one, a perfect one, a perfect one.” * A pilgrimage to Mecca and neighbouring spots made at the proper season in Dhul Hijja. Tirmidhi transmitted it.
وَعَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَنْ صَلَّى الْفَجْرَ فِي جَمَاعَةٍ ثُمَّ قَعَدَ يَذْكُرُ اللَّهَ حَتَّى تَطْلُعَ الشَّمْسُ ثُمَّ صَلَّى رَكْعَتَيْنِ كَانَتْ لَهُ كَأَجْرِ حَجَّةٍ وَعُمْرَةٍ» . قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «تَامَّةٍ تَامَّةٍ تَامَّةٍ» . رَوَاهُ التِّرْمِذِيُّ
 حسن  (الألباني)حكم :
Reference : Mishkat al-Masabih 971
In-book reference : Book 4, Hadith 394