Arabic (Original)
حَدَّثَنَا يَحْيَى عَنْ عُبَيْدِ اللَّهِ حَدَّثَنِي نَافِعٌ عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ قَالَ أَبِي وَقَالَ يَحْيَى بْنُ سَعِيدٍ مَرَّةً عَنْ عُمَرَ أَنَّهُ قَالَ يَا رَسُولَ اللَّهِ نَذَرْتُ فِي الْجَاهِلِيَّةِ أَنْ أَعْتَكِفَ لَيْلَةً فِي الْمَسْجِدِ فَقَالَ وَفِّ بِنَذْرِكَ.
English Translation
Yahya narrated to us, from 'Ubaydullah: Nafi' told me, from 'Abdullah ibn 'Umar — my father said, and Yahya ibn Sa'id once said "from 'Umar" — that he said: "O Messenger of Allah, I vowed, in the time before Islam, to seclude myself for a night in the mosque." He said: "Fulfill your vow."