Abu Dawud Book 7, Hadith Number 2446.

Narated By ‘Aisha, Ummul Mu’minin : According to the version of an-Nufayli, ‘Aisha said: The Property (PBUH) used to pass by a patient while he was observing i’tikaf (in the mosque), but he passed as usual, and did not stay asking about him. According to the version of Ibn Isa she said: The Prophet (PBUH) would visit a patient while he was observing i’tikaf.