Built on a chain of oaths — sun, moon, day, night, soul — building toward the claim that everyone is given an inner sense of right and wrong, and that success lies in purifying that inner self rather than corrupting it. Closes with the story of Thamud's destruction after they defied a warning and killed a sacred she-camel. It states that a soul that purifies itself succeeds, and one that corrupts itself fails, framing this inner effort as the deciding factor in a person's outcome, before turning to Thamud's specific failure with the sacred she-camel as a case study of that principle in action. The surah briefly recounts a specific individual among the Thamud who volunteered to carry out the killing of the sacred she-camel, described as the most wretched among them, singling out one person's specific decisive act within a broader collective failure.
Argues everyone is born with an inner sense of right and wrong, and success means purifying it — a compact statement of moral responsibility. The framing of success and failure purely in terms of self-purification versus self-corruption is often cited as a compact statement of Islamic moral psychology, locating the real battleground within the individual rather than external circumstance. Singling out one individual's decisive role within a collective wrongdoing is often cited in discussions of how shared blame doesn't erase individual responsibility for whoever actually carries out a harmful act.