A juz (plural ajza), also called a para in South Asia, is one of thirty roughly equal divisions of the written Quran. The division is made by length rather than by meaning, so a juz usually begins and ends in the middle of a surah; each is further split into two hizb and each hizb into quarters. Reciting one juz a night completes the whole Quran across a lunar month, a rhythm tied above all to Ramadan, when the entire text is recited in the nightly tarawih prayers. This portion spans Adh-Dhariyat 51:31 through Al-Hadid 57:29. A dense cluster: At-Tur ('The Mount'), An-Najm ('The Star') with the Prophet's vision, Al-Qamar ('The Moon') and the splitting sign, the refrain-poem Ar-Rahman ('The Most Merciful'), Al-Waqia ('The Inevitable Event') on the three ranks at Judgement, and Al-Hadid ('Iron').
Al-Ahqaf, opening this juz, is named for the wind-carved sand formations of southern Arabia associated with the destroyed people of Ad, a landscape early Muslim geographers continued to identify with real dune country in the region even as the historical Ad themselves left no securely identified archaeological trace. Al-Hujurat's teaching on manners and brotherhood, including its instruction to verify news from an unreliable source before acting on it (49:6), a verse traditionally connected to a specific reported incident involving a companion's mistaken report, has been cited in modern Islamic discussions of misinformation and verification as an early scriptural statement of the same principle.