Chapter: The Excellence of Monotheism and the Sins It Erases
And the saying of Allah, the Exalted: “Those who believe and do not mix their faith with wrongdoing—it is they who will have security, and they are rightly guided.” (1) [al-Anʿām 6:82]
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Relevance of this chapter to Kitāb al-Tawḥīd: After the first chapter explained the obligation of tawḥīd and its meaning, the present chapter sets out its virtue, its praiseworthy effects, and its beautiful outcomes—among them the expiation of sins—in order to encourage and urge the reader to embrace it.
bāb (chapter): In the language it denotes an entrance; in technical usage it is a heading that encompasses a body of knowledge containing, more often than not, several sections and issues.
yukaffir (expiates): In Arabic, takfīr means covering and concealing. In the Sharīʿah it is the erasure of a sin until it is as though it never existed.
min adh-dhunūb (of sins): the particle min here is explanatory, not partitive; and dhunūb is the plural of