Musannaf Ibn Abi Shaybah 12851 — One who has intercourse during

Musa bin Abi Ma'bad said that a woman of his family had to observe i'tikaf (spiritual retreat) for a month in the mosque. She had stayed in i'tikaf for twenty-nine days when she began menstruating, so she returned to her home; then when she became pure, her husband had intercourse with her. Musa said: I came to Salim and al-Qasim, and they both said to me: First go to Sa'id bin al-Musayyib, then come to us. I went to Sa'id bin al-Musayyib and asked him about it. He said: The two of them have breached one of the limits of Allah and gone against the Sunnah; the woman must observe the i'tikaf again (from the beginning).