Hadith.4321 - Abdullah ibn Muskan narrated from Badr ibn Khalil, who said that Abu Abdillah was asked about a man who was imprisoned and vowed, saying, "It is upon me, for the sake of Allah (swt), that if I am released from this prison, I will fast for a year." The man was then released from prison but feared that he might not be able to fast for an entire year. Imam said: "He should fast for one month, and then from the second month, he should fast a few days so that he completes two consecutive months. After that, he should continue fasting, and whenever he misses a day, he should give a mudd of food in charity. Whenever he fasts, it will be counted for him until he completes a year."