[Explanation]
The author—may Allah have mercy on him—relates from the Commander of the Believers, ʿUmar ibn al-Khattab (may Allah be pleased with him), that the Prophet (peace and blessings be upon him) said: “Whoever sleeps through his nightly portion, or part of it, and then makes it up between the dawn prayer and the noon prayer, it will be recorded for him as though he had performed it during the night.”

This shows that if a person is accustomed to a certain act of worship he should preserve it, even after its prescribed time has elapsed.

The word ḥizb (portion) means a part of something; from it come the aḥzāb of the Quran, and likewise the aḥzāb—parties or factions—among people. Thus, if a person normally prays at night but sleeps through all or part of it, and then makes it up between the dawn and noon prayers, it is counted for him as though he had prayed during the night. If, however, his regular practice is to end the night with witr, then when he makes it up during the day he should not pray an odd number; rather, he should add one rakʿah so that it becomes even. Therefore, if he habitually offers three rakʿahs of witr, he should make up four; if five, he should make up six; if seven, he should make up eight, and so on.

The proof for this is the hadith of ʿĀʾishah (may Allah be pleased with her) stating that when the Prophet (peace and blessings be upon him) was overcome by sleep or illness at night, he would pray during the day twelve rakʿahs—and making up