expression, godan verb (-ru)
fall into sin; slide into wrongdoing
A literary or religious expression for succumbing to moral transgression. Not used in casual conversation; appears in sermons, classical texts, or moralistic writing.
誘惑に負けて罪に陥るな。
Do not give in to temptation and fall into sin.
罪を犯す is the common, neutral way to say 'commit a crime/sin'. 罪に陥る is more literary and emphasizes the process of falling into a sinful state.
A fixed phrase composed of 罪 (sin, crime) + に (particle) + 陥る (to fall into). The verb 陥る itself carries a sense of sinking into an undesirable state.