Al-Bayyina ('The Clear Proof'), 8 verses usually placed in Medina, states that the People of the Book and the polytheists were not to be left until a clear proof came, a messenger reciting purified pages. It defines pure religion as sincere worship, prayer and charity, and names the believers 'the best of creatures' (98:7).
Al-Bayyina's own classification is genuinely unsettled among the earliest authorities: Ibn al-Zubayr and Ata ibn Yasar held it Medinan, while Aisha, and later commentators including Abu Hayyan, preferred a Meccan dating, a division al-Suyuti records without resolving. Its naming of 'the People of the Book and the polytheists' as two distinct groups both addressed by the same clear proof (98:1) is read by classical commentators as treating Jewish, Christian and pagan Arabian audiences as facing a structurally similar demand for response to revelation, even while the Quran elsewhere draws sharp theological distinctions between the People of the Book and outright idolaters. Classical commentators read the surah's description of the righteous performing prayer and charity 'sincerely, as people of true faith' (98:5) as deliberately restating, in condensed form, the same minimal core of religious obligation the Quran elsewhere elaborates in far greater legal detail, making this short surah a kind of summary statement of what 'pure religion' consists of at its most basic. Its closing promise that the believers are 'the best of creatures,' who will dwell in gardens 'forever' as God is 'pleased with them and they are pleased with Him' (98:7-8), is regularly cited in later Islamic writing on mutual divine and human satisfaction (rida) as among the Quran's clearest expressions of that reciprocal relationship.