From G1909 (epi, upon) and G1416 (duno, to sink/set). To set or go down upon โ used of the sun setting. Appears only in Ephesians 4:26, in the famous command: 'Let not the sun go down (epidueto) upon your wrath.'
Paul's command 'Be ye angry, and sin not: let not the sun epiduo upon your wrath' (Eph 4:26) acknowledges that anger itself is not sin โ even God is angry at wickedness. The sin enters when anger is nursed, harbored, and allowed to set up permanent residence. The image of the setting sun creates an urgent deadline: resolve it today. Don't carry it overnight. The theological wisdom: unresolved anger becomes bitterness, and bitterness 'gives place to the devil' (Eph 4:27). The time-bound nature of godly anger prevents it from metastasizing into the destructive force that tears apart relationships and communities.