What are the conditions that need to be met in order for a fast to be invalid?

All of the above matters are things that invalidate the fast. All of them – apart from menses and nifaas – only invalidate the fast if three conditions are met:

• That the person was aware of the ruling and not ignorant of it.

• That he did it knowingly and not out of forgetfulness.

• That he did it by choice and was not forced to do it.