عَنْ أَبِي هُرَيْرَةَ رضي الله عنه قَالَ: قَالَ رَسُولُ اللهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ: «صَلَاةُ الرَّجُلِ فِي جَمَاعَةٍ تَزِيدُ عَلَى صَلَاتِهِ فِي بَيْتِهِ، وَصَلَاتِهِ فِي سُوقِهِ، بِضْعًا وَعِشْرِينَ دَرَجَةً، وَذَلِكَ أَنَّ أَحَدَهُمْ إِذَا تَوَضَّأَ فَأَحْسَنَ الْوُضُوءَ، ثُمَّ أَتَى الْمَسْجِدَ لَا يَنْهَزُهُ إِلَّا الصَّلَاةُ، لَا يُرِيدُ إِلَّا الصَّلَاةَ، لَمْ يَخْطُ خَطْوَةً إِلَّا رُفِعَ لَهُ بِهَا دَرَجَةٌ، وَحُطَّ عَنْهُ بِهَا خَطِيئَةٌ، حَتَّى يَدْخُلَ الْمَسْجِدَ، فَإِذَا دَخَلَ الْمَسْجِدَ كَانَ فِي الصَّلَاةِ مَا كَانَتِ الصَّلَاةُ هِيَ تَحْبِسُهُ، وَالْمَلَائِكَةُ يُصَلُّونَ عَلَى أَحَدِكُمْ مَا دَامَ فِي مَجْلِسِهِ الَّذِي صَلَّى فِيهِ، يَقُولُونَ: اللّهُمَّ ارْحَمْهُ، اللّهُمَّ اغْفِرْ لَهُ، اللّهُمَّ تُبْ عَلَيْهِ، مَا لَمْ يُؤْذِ فِيهِ، مَا لَمْ يُحْدِثْ فِيهِ». متفق عليه

On the authority of Abu Hurairah (may Allah be pleased with him), who said: The Messenger of Allah (peace be upon him) said: "The prayer of a man in congregation exceeds his prayer in his house or in the marketplace by over twenty degrees. That is because when one of you performs ablution and perfects it, then comes to the mosque with no other purpose driving him except the prayer, wanting nothing but the prayer, he does not take a step except that he is raised by it one degree and one sin is erased from him, until he enters the mosque. When he enters the mosque, he is considered to be in prayer as long as the prayer detains him. And the angels send blessings upon any one of you as long as he remains in the place where he prayed, saying: 'O Allah, have mercy on him. O Allah, forgive him. O Allah, accept his repentance' -- so long as he does not cause harm therein, so long as he does not nullify his ablution therein." Agreed upon (narrated by al-Bukhari and Muslim).