WHEN THE ANGELS SUPPLICATE FOR BLESSINGS H 1078 "The angels supplicate for blessings upon the one who continues to remain in his place of prayer in a state of purity after the prayer is finished, saying, 'O Allah, forgive him; O Allah have mercy on him.'" R 1078 Bukhari with a chain up to Abu Hurairah who related that the Messenger of Allah, praise and peace be upon him, said this.
1062 - وعنه رضي الله عنه : أنَّ رَسُول اللهِ صلى الله عليه وآله وسلم ، قَالَ : "الْمَلائِكَةُ تُصَلِّي عَلَى أَحَدِكُمْ مَا دَامَ فِي مُصَلاَّهُ الَّذِي صَلَّى فِيهِ، مَا لَمْ يُحْدِثْ، تَقُولُ : اللَّهُمَّ اغْفِرْ لَهُ ، اللَّهُمَّ ارْحَمْهُ" رواه البُخَارِيُّ .