حَدَّثَنَا مُحَمَّدٌ حَدَّثَنَا شُعْبَةُ عَنْ عُبَيْدِ اللَّهِ بْنِ عُمَرَ عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ أَنَّ عُمَرَ كَانَ قَدْ جَعَلَ عَلَيْهِ يَوْمًا يَعْتَكِفُهُ فِي الْجَاهِلِيَّةِ فَسَأَلَ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ عَنْ ذَلِكَ فَأَمَرَهُ أَنْ يَعْتَكِفَ
مسند امام احمد بن حنبل · Hadith 5539
It was narrated from Ibn 'Umar that 'Umar had obliged himself during the JaahiLiyyah to spend a night in i'tikaaf. He asked the Messenger of Allah (PBUH) about that and he told him to observe i'tikaaf.
Translated by Dr. Muhammad Muhsin Khan · Reviewed by Islamic University of Madinah · Published March 2020
Sanad
حَدَّثَنَا مُحَمَّدٌ حَدَّثَنَا شُعْبَةُ عَنْ عُبَيْدِ اللَّهِ بْنِ عُمَرَ عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ