(79) باب مَا جَاءَ فِي الاِعْتِكَافِ إِذَا خَرَجَ مِنْهُ
Anas bin Malik narrated:
"The Prophet would perform I'tikaf during the last ten (nights) of Ramadan. One year he did not perform I'tikaf, so he performed I'tikaf for twenty (nights) in the following year." (FR)
Reference (FR): Jami` at-Tirmidhi 803 (FR)
In-book reference (FR): Book 8, Hadith 122 (FR)
English translation (FR): Vol. 2, Book 3, Hadith 803 (FR)