"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."
Reference: Jami` at-Tirmidhi 803 In-book : Book 8, Hadith 122 English translation : Vol. 2, Book 3, Hadith 803
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