A Battle's Aftermath and a New Surah's Opening

Juz 4 finishes the second half of Al-i-Imran, one hundred and eight verses covering the aftermath of the Battle of Uhud, before opening An-Nisa and carrying only its first twenty-three of one hundred and seventy-six verses, a small fraction of that surah. The imbalance is typical of how juz boundaries fall wherever the accumulated text reaches roughly a thirtieth of the whole, regardless of where a surah's own argument happens to end.

In communities that pace the nightly tarawih prayers of Ramadan at one juz per night, this is customarily the fourth night's portion, though many mosques recite faster to finish early in the month or slower to spread the reading further, and some congregations instead divide the whole Quran among thirty reciters for a single collective khatm. Huffaz reviewing memorised portions often pace themselves by a juz's two hizb and four quarter-hizb divisions rather than by surah, since these evenly sized units make a consistent daily review schedule possible regardless of where a surah boundary falls. Printed Mushafs typically mark each juz's opening in the margin with a small medallion inscribed with its number, a page-level convention distinct from the finer hizb and quarter-hizb marks placed within the text itself to guide reciters mid-portion.