Hadith on Mosques: Supplication for entering and exiting the Masjid

Abu Usaid reported: The Messenger of Allah, peace and blessings be upon him, said, “When one of you enters the mosque, then let him say: O Allah, open for me the doors of your mercy. When he leaves, then let him say: O Allah, verily, I ask you for your favor.”
Source: Sahih Muslim 713
Grade: Sahih (authentic) according to Imam Muslim

عَنْ أَبِي أُسَيْدٍ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِذَا دَخَلَ أَحَدُكُمْ الْمَسْجِدَ فَلْيَقُلْ اللَّهُمَّ افْتَحْ لِي أَبْوَابَ رَحْمَتِكَ وَإِذَا خَرَجَ فَلْيَقُلْ اللَّهُمَّ إِنِّي أَسْأَلُكَ مِنْ فَضْلِكَ

713 صحيح مسلم كِتَاب صَلَاةِ الْمُسَافِرِينَ وَقَصْرِهَا باب مَا يَقُولُ إِذَا دَخَلَ الْمَسْجِدَ

Ash-Shafi’ee: The Sunnah is to seek seclusion in the mosque during the last ten nights of Ramadan

Imam Ash-Shafi’ee and his companions, may Allah have mercy on them, said, “Whoever desires to follow the example of the Prophet, peace be upon him, should seek seclusion in the mosque during the last ten nights of Ramadan; so let him enter the mosque before the setting of the sun on the twenty first night.”

[An-Nawawi, Al-Majmu 501]

قال الشافعي والأصحاب ومن أراد الاقتداء بالنبي صلى الله عليه وسلم في الاعتكاف في العشر الأواخر من رمضان فينبغي أن يدخل المسجد قبل غروب الشمس ليلة الحادي والعشرين منه

المجموع شرح المهذب يحيى بن شرف النووي

Hadith on Ramadan: The Prophet did not pray some nights in the mosque so that it would not become an obligation

Aisha reported: The Messenger of Allah, peace be upon him, prayed one night in the mosque and some people prayed along with him. Then, he prayed the following night and many people joined him. Then, on the third or fourth night there was a large gathering but the Messenger of Allah did not come out for them. When it was morning, he said, “I saw what you were doing, but I refrained from coming to you because I fear that this prayer might become an obligation for you.” Aisha said, “This was during the month of Ramadan.”

[Sahih Muslim, Book 4, Number 1666]

عَنْ عَائِشَةَ  أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ صَلَّى فِي الْمَسْجِدِ ذَاتَ لَيْلَةٍ فَصَلَّى بِصَلَاتِهِ نَاسٌ ثُمَّ صَلَّى مِنْ الْقَابِلَةِ فَكَثُرَ النَّاسُ ثُمَّ اجْتَمَعُوا مِنْ اللَّيْلَةِ الثَّالِثَةِ أَوْ الرَّابِعَةِ فَلَمْ يَخْرُجْ إِلَيْهِمْ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَلَمَّا أَصْبَحَ قَالَ قَدْ رَأَيْتُ الَّذِي صَنَعْتُمْ فَلَمْ يَمْنَعْنِي مِنْ الْخُرُوجِ إِلَيْكُمْ إِلَّا أَنِّي خَشِيتُ أَنْ تُفْرَضَ عَلَيْكُمْ قَالَ وَذَلِكَ فِي رَمَضَانَ

صحيح مسلم  كتاب صلاة المسافرين وقصرها  باب الترغيب في قيام رمضان وهو التراويح

Hadith on Remembrance: Whoever remembers Allah will have tranquility in his heart

Narrated Abu Hurairah: The Messenger of Allah, peace be upon him, said: “There are no people who remember Allah but that angels encompass them, mercy covers them, tranquility descends upon them, and Allah mentions them to those with Him.”

[Jami’ at-Tirmidi, Book 45, Number 3378]

أَبِي هُرَيْرَةَ وَأَبِي سَعِيدٍ الْخُدْرِيِّ أَنَّهُمَا شَهِدَا عَلَى رَسُولِ اللَّهِ صلى الله عليه وسلم أَنَّهُ قَالَ مَا مِنْ قَوْمٍ يَذْكُرُونَ اللَّهَ إِلاَّ حَفَّتْ بِهِمُ الْمَلاَئِكَةُ وَغَشِيَتْهُمُ الرَّحْمَةُ وَنَزَلَتْ عَلَيْهِمُ السَّكِينَةُ وَذَكَرَهُمُ اللَّهُ فِيمَنْ عِنْدَهُ

Hadith on Mosques: Whoever builds a house for Allah, then Allah will build for him a house in Paradise

Mahmud ibn Labid reported: Uthman ibn Affan decided to rebuild the mosque (in Medina) but the people did not like this idea and they wished that it would be preserved in the same form. Therefore, Uthman said: I heard the Messenger of Allah, peace be upon him, say, “He who builds a mosque for Allah, then Allah will build for him (a house) like it in Paradise.”

[Sahih Muslim, Book 42, Number 7110]

عَنْ مَحْمُودِ بْنِ لَبِيدٍ أَنَّ عُثْمَانَ بْنَ عَفَّانَ أَرَادَ بِنَاءَ الْمَسْجِدِ فَكَرِهَ النَّاسُ ذَلِكَ وَأَحَبُّوا أَنْ يَدَعَهُ عَلَى هَيْئَتِهِ فَقَالَ سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقُولُ مَنْ بَنَى مَسْجِدًا لِلَّهِ بَنَى اللَّهُ لَهُ فِي الْجَنَّةِ مِثْلَهُ

صحيح مسلم كتاب الزهد والرقائق باب فضل بناء المساجد

Hadith on Pilgrimage: Do not perform a religious journey except to the Sacred Masajid in Mecca, Medina, and Jerusalem

Abu Huraira reported: I heard from the Prophet, peace be upon him, that he said, “Do not undertake a (religious) journey except to three mosques: this mosque of mine (in Medina), the Sacred Mosque (in Mecca), and the Farthest Mosque (in Jerusalem).”

[Sahih Muslim, Book 7, Number 3218]

عَنْ أَبِي هُرَيْرَةَ  يَبْلُغُ بِهِ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ لَا تُشَدُّ الرِّحَالُ إِلَّا إِلَى ثَلَاثَةِ مَسَاجِدَ مَسْجِدِي هَذَا وَمَسْجِدِ الْحَرَامِ وَمَسْجِدِ الْأَقْصَى

صحيح مسلم كتاب الحج باب لا تشد الرحال إلا إلى ثلاثة مساجد