Answered by Shaykh Faraz Rabbani
Is consecutive (wisal) fasting permitted? Can it count as a make up fast?
In the Name of Allah, with blessings and peace on the Messenger of Allah
Walaikum assalam wa rahmatullah,
I pray this finds you in the best of health and spirits.
The Messenger of Allah (peace and blessings be upon him) said,
The continuous fasting (sawm al-wisal) that is prohibitively disliked (because of the Prophetic prohibition against it) is to fast two or more consecutive days without breaking the fast at night. [Shurunbulali, Maraqi al-Falah, 1.240]
However, if performed, such a fast would be legally valid, though sinful. If one had intended a make up fast for each day of such fasts, those make up fasts would be valid.
And Allah alone gives success.
Wassalam,
Faraz Rabbani
( وكره صوم الوصال ولو ) واصل بين ( يومين ) فقط للنهي عنه ( وهو ) أي الوصال ( أن لا يفطر بعد الغروب أصلا حتى يتصل صوم الغد بالأمس )