I heard ‘Ali ؓ say: The Messenger of Allah ﷺ said: “When a person sits in the place where he prayed after praying the angels send blessings upon him, and their blessings upon him are: O Allah, forgive him. O Allah have mercy on him. And if he sits waiting for the prayer, the angels send blessings upon him, and their blessings upon him are: O Allah, forgive him, O Allah have mercy on him.  

قَالَ رَسُولُ اللهِ ﷺ إِنَّ الْعَبْدَ إِذَا جَلَسَ فِي مُصَلاهُ بَعْدَ الصَّلاةِ صَلَّتْ عَلَيْهِ الْمَلائِكَةُ وَصَلاتُهُمْ عَلَيْهِ اللهُمَّ اغْفِرْ لَهُ اللهُمَّ ارْحَمْهُ وَإِنْ جَلَسَ يَنْتَظِرُ الصَّلاةَ صَلَّتْ عَلَيْهِ الْمَلائِكَةُ وَصَلاتُهُمْ عَلَيْهِ اللهُمَّ اغْفِرْ لَهُ اللهُمَّ ارْحَمْهُ  

l entered upon Abu ‘Abdur-Rahman as-Sulami who had prayed Fajr and was sitting in the mosque.I said: Why donʿt you go to your bed, for it will be more comfortable for you? He said: I heard ʿAli ؓ say: I heard the Messenger of Allah ﷺ say: “Whoever pray Fajr, then sits in the place where he has prayed, the angels will send blessings upon him and their blessings upon him will be: ‘O Allah, forgive him. O Allah, have mercy on him.ʿ And whoever waits for the prayer, the angels will send blessings upon him and their blessings upon him will be: ʿO Allah, forgive him, O Allah, have mercy on him.”  

دَخَلْتُ عَلَى أَبِي عَبْدِ الرَّحْمَنِ السُّلَمِيِّ وَقَدْ صَلَّى الْفَجْرَ وَهُوَ جَالِسٌ فِي الْمَسْجِدِ فَقُلْتُ لَوْ قُمْتَ إِلَى فِرَاشِكَ كَانَ أَوْطَأَ لَكَ فَقَالَ سَمِعْتُ عَلِيًّا يَقُولُ سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ مَنْ صَلَّى الْفَجْرَ ثُمَّ جَلَسَ فِي مُصَلاهُ صَلَّتْ عَلَيْهِ الْمَلائِكَةُ وَصَلاتُهُمْ عَلَيْهِ اللهُمَّ اغْفِرْ لَهُ اللهُمَّ ارْحَمْهُ وَمَنْ يَنْتَظِرُ الصَّلاةَ صَلَّتْ عَلَيْهِ الْمَلائِكَةُ وَصَلاتُهُمْ عَلَيْهِ اللهُمَّ اغْفِرْ لَهُ اللهُمَّ ارْحَمْهُ  

"مَنْ صَلَّى الفَجْرَ، ثمَّ جَلَسَ فِي مُصَلاهُ يَذْكُر اللهَ -تَعَالى- صَلَّتْ عَلَيه المَلائِكَةُ، وَصَلاتُهُمْ عَلَيهِ: اللَّهمَّ اغْفِر لَهُ، اللَّهمَّ ارْحَمْهُ، وَمَنْ جَلَسَ يَنْتَظِر الصَّلاةَ صَلَّتْ عَلَيهِ المَلائِكَةُ، وَصَلاتُهُمْ عَلَيهِ: اللَّهمَّ اغْفِر لَهُ، اللَّهمَ ارْحَمْهُ".