What action constitutes retracting the vow of *Ila'* (*Fay'*)?

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The scholarly consensus among those whose opinions are known, including Ibn al-Mundhir, is that retracting the vow of *Ila'* (*Fay'*) is achieved through sexual intercourse (*jima'*). This view is attributed to Ibn Abbas, Ali, Ibn Mas'ud, Masruq, 'Ata', al-Sha'bi, al-Nakha'i, Sa'id ibn al-Musayyab, al-Thawri, al-Awza'i, al-Shafi'i, Abu Ubaidah, and the Ashab al-Ra'y (Hanafi jurists), provided there is no valid excuse. The root of *Fay'* is 'to return,' as the sun's shadow after its zenith is called *fay'* because it returns from west to east; similarly, intercourse by the one who swore the oath is called *Fay'* because he returns to the action he abandoned.