A Resident Combining Two Prayers due to Study
Question :
Is it permissible for us to combine two prayers while residing in Al-Madinah when we have classes that it is not possible for us to leave, on the basis of the fact that the Prophet combined two prayers without cause of travel, rain or illness, or must we leave the lesson and go out to the prayer?
Answer:
You must perform the five compulsory prayers at their stated times, and classes are not considered an excuse for you to delay any of the prayers from the times stated by the Messenger of Allah. As for the Hadith which you have indicated, the regular and well reported practice of the Messenger contradicts it, therefore you must arrange your classes so that you can perform the prayers at their stated times.
Source:
The Permanent Committee
Fatawa Islamiyah, Vol. 2 Pages 428-429