Maliks Muwatta Book 18, Hadith Number 40.

Section : The Fasting of Someone who Kills by Mistake or Pronounces the Dhihar Form of Divorce.

Yahya related to me, and I (myself) heard Malik say, “The best that I have heard about some one who has to fast for two consecutive months because of having killed someone by mistake or having pronounced the dhihar form of divorce, becoming very ill and having to break his fast, is that if he recovers from his illness and is strong enough to fast, he must not delay doing so. He continues his fast from where he left off.

Similarly, a woman who has to fast because of having killed some one by mistake should not delay resuming her fast when she has become pure after her period. She continues her fast from where she left off.

No one who, by the Book of Allah, has to fast for two consecutive months may break his fast except for a reason – illness or menstruation. He must not travel and break his fast.”

Malik said, “This is the best that I have heard about the matter.”