Jami' al-Saghir / Jam' al-Jawami' (al-Suyuti) 22013a
"مَنْ صَلَّى فِي مَسْجِد جَمَاعَة أَرْبَعِينَ لَيلَةً لا تَفُوتُهُ الرَّكْعَةُ الأولَى مِنْ صَلاةِ العِشَاءِ كَتَبَ اللهُ لَهُ بِهَا عِتْقًا مِن النَّارِ".
Translation
Machine translation, not reviewed
"Whoever prays in a congregational mosque for forty nights, not missing the first rak'ah of the night prayer, Allah will write for him by it a freedom from the Fire."
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Notes
[هـ] ابن ماجة والحكيم عن عمر
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