(36) باب إِذَا نَذَرَ ثُمَّ أَسْلَمَ قَبْلَ أَنْ يَفِيَ
It was narrated from Ibn 'Umar that 'Umar had vowed -during the Jahiliyyah- to spend a day in 'Itikaf. He asked the Messenger of Allah about that, and he commanded him to perform the 'Itikaf. (DE)
Reference (DE): Sunan an-Nasa'i 3822 (DE)
In-book reference (DE): Book 35, Hadith 62 (DE)
English translation (DE): Vol. 4, Book 35, Hadith 3853 (DE)