The concession allowing the Imam to offer a lengthy prayer
باب الرُّخْصَةِ لِلإِمَامِ فِي التَّطْوِيلِ
3835
An Nasai
Sahih (Darussalam)
أَخْبَرَنَا إِسْحَاقُ بْنُ مُوسَى، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ أَيُّوبَ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، عَنْ عُمَرَ، أَنَّهُ كَانَ عَلَيْهِ لَيْلَةٌ نَذَرَ فِي الْجَاهِلِيَّةِ يَعْتَكِفُهَا فَسَأَلَ رَسُولَ اللَّهِ صلى الله عليه وسلم فَأَمَرَهُ أَنْ يَعْتَكِفَ .
It was narrated from Ibn 'Umar, that 'Umar had vowed to spend a night in 'Itikaf during the Jahiliyyah. He asked the Messenger of Allah about that, and he ordered him to perform the 'Itikaf.
Reference: Sunan an-Nasa'i 3820 In-book : Book 35, Hadith 60 English translation : Vol. 4, Book 35, Hadith 3851
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