The Holy Quran 9:18 — Surah At-Tawbah
Arabic text
إِنَّمَا يَعْمُرُ مَسَـٰجِدَ ٱللَّهِ مَنْ ءَامَنَ بِٱللَّهِ وَٱلْيَوْمِ ٱلْـَٔاخِرِ وَأَقَامَ ٱلصَّلَوٰةَ وَءَاتَى ٱلزَّكَوٰةَ وَلَمْ يَخْشَ إِلَّا ٱللَّهَ ۖ فَعَسَىٰٓ أُو۟لَـٰٓئِكَ أَن يَكُونُوا۟ مِنَ ٱلْمُهْتَدِينَ
Translation
Only those should attend (and care for) Allaah's places of worship who believe in Allaah and the Last Day, who establish salaah, who pay Zakaah and who fear Allaah only (who are clean from all impurities). It is they who are expected to be rightly guided.
Tafsir (excerpt) — Tafsir Usmani
The meaning of maintaining the mosques: it was said earlier that the Muslims will not simply be left alone without being tested; rather, their steadfastness will be seen in great and resolute deeds (for example, jihad (fighting in the path of Allah) and the like)
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