Ruling: If the person in question is confident that he can complete his ongoing voluntary (Nafl) prayer and still catch the funeral prayer (Salat al-Janazah), he should complete his Nafl prayer first and then join the funeral prayer. However, if he is uncertain and fears that the funeral prayer will be missed before he finishes, he should discontinue (break) his Nafl prayer and join the funeral prayer immediately. This is because a discontinued Nafl prayer can be made up later (Qada'), whereas there is no make-up (Qada') for a missed funeral prayer. Subsequently, it will be necessary for him to perform the make-up (Qada') of the discontinued Nafl prayer.