And Ibn Abi 'Umar narrated to us, 'Abd al-'Aziz—meaning al-Darawirdi—narrated to us, from Yazid, from Muhammad ibn Ibrahim, from Abu Salama ibn 'Abd al-Rahman, from Abu Sa'id al-Khudri, may God be pleased with him, that he said: The Messenger of God, peace and blessings be upon him, used to observe i'tikaf during Ramadan in the ten days that fall in the middle of the month. And he related the hadith similarly, except that he said: "Let him remain in his place of i'tikaf." And he said: And his forehead was covered with mud and water.