The Case of One Who Wakes up in the Morning with an Intention to Fast, but Who Does Not Do So or Vice Versa when Fasting Is a Compensatory Fast for the Missed Fast in the Month of Ramadan or Other Days

1. Ali ibn Ibrahim has narrated from his father from Ibn Abi ‘Umayr from Hammad ibn ‘Uthaman from al-Halabiy who has said the following: “This is concerning my question before abu ‘ Abd Allah عليه السلام, about a man who with the intention to fast wakes up in the morning, then for a certain reason decides not to fast. He (the Imam) said, ‘Until midday it is his choice to fast or not to fast.’ I then asked, ‘Is he required to make Qada’ (compensatory fast) for such fast if he discontinues it?’ He (the Imam) said, ‘Yes, it is a valid deed that he intended to do and he should complete it.’ I then asked, ‘Can a man who, when the day is up, decide to fast, do so?’ He (the Imam) said, ‘Yes, it is permissible for him to do so.’”