Hadith 4:819
Ma'n ibn 'Isa narrated to us, from Ibn Abi Dhi'b, from al-Zuhri, who said: Whoever has intercourse with his wife while he is in i'tikaf, upon him is the same expiation as that which is upon the one who has intercourse during Ramadan.
حدثنا معن بن عيسى عن أبن أبي ذئب عن الزهري قال من أصاب امرأته وهو معتكف فعليه من الكفارة مثل ما على الذي يصيب في رمضان