At-Taghabun ('The Mutual Disillusion'), 18 verses generally placed in Medina, names the Day of Judgement the day of taghabun, of mutual gain and loss, when the truly successful and the truly ruined are made plain (64:9). It warns that spouses and children can be a trial and calls for trust in God. At-Taghabun's date is itself disputed among classical authorities, some transmitting it as Meccan, most later compilers as Medinan, a split al-Suyuti records among the surahs whose Meccan or Medinan status was never fully settled by consensus. Its description of this world's goods and offspring as 'a trial' (64:15), phrased almost identically to a verse in the Meccan surah Al-Anfal, is cited by scholars of the Quran's internal cross-references as one of several cases where near-identical language recurs across surahs otherwise assigned to different periods, a pattern used on both sides of debates over classification.
The surah's naming of the Day of Judgement as yawm al-taghabun, the day of mutual gain and loss, drawing on a root elsewhere used for a losing trade or a bad bargain, is read by classical philologists as a deliberately commercial metaphor, casting the whole of moral life as a transaction whose profit or loss becomes final and irreversible only on that Day. Its statement that no calamity befalls except by God's permission, followed immediately by the promise that whoever believes has their heart rightly guided (64:11), is frequently paired in Islamic devotional writing on patience during hardship (sabr).