What is the ruling on one who has intercourse with his wife while observing a fast as expiation for unintentional killing, and what are the consequences?

The expiation for unintentional killing is the freeing of a believing slave. If one cannot find one, then it is fasting for two consecutive months. If a fasting person engages in intercourse with his wife during the fast of expiation for unintentional killing, then he must repent and restart the two-month fast from the beginning due to the disruption of continuity.