Hadith.2098 - It is narrated from Dawud ibn Sirhan, who said: "I was in Medina during the Month of Ramadan, and I said to Abu Abdullah عليه السلام: 'I wish to perform i'tikaf. What should I say, and what should I make obligatory upon myself?' Imam عليه السلام said: 'Do not leave the mosque except for an unavoidable necessity, and do not sit under any shade until you return to your place in the mosque.'"