وإضافة الصوم إليه
The association of fasting with the month.
Ramadan is a defined period, but the daily observances retain their legally prescribed number and structure. The unity of a month does not reduce the obligation to one fasting day, nor does every hour create an independent fast.
A person who fasts the first day has not thereby performed the second day's fast. Conversely, morning and afternoon of one fast are not separate obligatory fasts. A cause must be understood with the law's specified unit of performance.