This excerpt is taken from Sheikh Abu Hamza Abdul Khaliq Siddiqi's book Sahih Fazail-e-Amaal.
Allah Almighty says:
﴿مَا كَانَ لِلْمُشْرِكِينَ أَن يَعْمُرُوا مَسَاجِدَ اللَّهِ شَاهِدِينَ عَلَىٰ أَنفُسِهِم بِالْكُفْرِ ۚ أُولَٰئِكَ حَبِطَتْ أَعْمَالُهُمْ وَفِي النَّارِ هُمْ خَالِدُونَ . إِنَّمَا يَعْمُرُ مَسَاجِدَ اللَّهِ مَنْ آمَنَ بِاللَّهِ وَالْيَوْمِ الْآخِرِ وَأَقَامَ الصَّلَاةَ وَآتَى الزَّكَاةَ وَلَمْ يَخْشَ إِلَّا اللَّهَ ۖ فَعَسَىٰ أُولَٰئِكَ أَن يَكُونُوا مِنَ الْمُهْتَدِينَ. ﴾
"And it is not for the polytheists to maintain the mosques of Allah while they bear witness against themselves of disbelief. Their deeds have become worthless, and they will abide in Hell forever. Only those should maintain the mosques of Allah who believe in Allah and the Last Day, establish prayer, give zakah, and fear none except Allah. It is expected that they will be among the guided."
Reference: (9-At-Tawbah:17-18)
From this verse, it is understood that the care of Allah's mosques is not the responsibility of disbelievers and polytheists, but it is the duty of the believers. And at the end of the verse, those who maintain the mosques are counted among the guided people.
عن عثمان بن عفان رضى الله عنه قال: سمعت رسول الله صلى الله عليه وسلم يقول: من بنى مسجدا لله ، بنى الله له فى الجنة مثله .
Sayyiduna Uthman bin Affan (may Allah be pleased with him) says: I heard the Messenger of Allah (peace be upon him) say: "Whoever builds a mosque for the sake of Allah, Allah will build for him a house like it in Paradise."
Reference: Sahih Muslim, Book of Zuhd, Chapter on the Virtue of Building Mosques, No. 533.
Sayyida Aisha Siddiqah (may Allah be pleased with her) narrates:
أمر رسول الله صلى الله عليه وسلم أن تتخذ المساجد فى الدور ، وأن تنظف وتطيب .
"The Messenger of Allah (peace be upon him) ordered to build mosques in neighborhoods and to keep them clean and perfumed."
Reference: Sunan Abu Dawood, Book of Prayer, Chapter on Taking Mosques in Houses, No. 455 - Sunan Ibn Majah, Book of Mosques, Chapter on Purifying and Perfuming Mosques, No. 758 - Al-Albani (may Allah have mercy on him) declared it authentic.
Besides this, among the fortunate ones whom Allah will grant a place under the shade of His Throne on the Day of Resurrection is also the person who has a connection with the mosque. As mentioned in the hadith:
ورجل قلبه معلق فى المساجد
"And (such a person will also have a place under the shade of the Throne) whose heart is attached to the mosque. (Meaning: whenever the time for prayer comes, I go to the mosque.)"
Reference: Sahih al-Bukhari, Book of Zakah, Chapter on Charity with the Right Hand, No. 1423 - Sahih Muslim, Book of Zakah, Chapter on the Virtue of Concealing Charity, No. 1031.
