Hizb 18 closes Juz 9 and crosses from Al-Araf into Al-Anfal partway through, a shift in register as sharp as any this account has described: from a philosophical account of a covenant preceding birth to a historical narrative of a specific armed engagement, within a single hizb's four rub al-hizb quarters.
In tarawih recitation this hizb typically opens the ninth night, and congregations that recite Al-Anfal's material on Badr with attention to its historical setting sometimes treat this hizb as a natural point to introduce the battle's background, even though nothing in the hizb or quarter marks themselves signals that a shift in kind, from timeless covenant to dated historical event, has just occurred.
Because Al-Anfal is shorter than several of the surrounding suras, this hizb also illustrates how the sixty-part scheme handles a comparatively brief chapter: rather than giving Al-Anfal its own dedicated hizb boundaries, the scheme simply continues counting length across the sura's edges in both directions, here and again where Hizb 19 crosses into At-Tawba.
Commentators have long treated the covenant passage as one of the Quran's more philosophically difficult single verses, and its proximity within this hizb to a concrete historical battle narrative is sometimes used to illustrate how the thirty-juz scheme sits Quranic philosophy and Quranic history side by side with no signal that one kind of material has given way to another.