"In your anger do not sin" in the NT comes from the parallel passage in Psalms.In the incarnation Christ had to willingly suffer death to be the atoning sacrifice taught in Psalm 4 "offer right sacrifices". The OT zabah is lit. offer the "animal that has been slain."Tearing the animal into pieces is a appropriate metaphor God properly applying the eternal curses upon Jesus. God uses this metaphor when He upbraids Israel for focusing on the physical traits of the animal. Ps50 "Consider this, you who forget God, or I will tear you to pieces, with none to rescue:" If we offer the sacrifice without the authoritative pronouncement of death to the wicked God is not pleased. The sacrifice was more than an atonement. It was a consecration of the covenant promises. The Psalmist is teaching they recited by heart the law with the ambivalent attitude displayed in the sacrifice.16 But to the wicked, God says: "What right have you to recite my laws or take my covenant on your lips? They did not offer the sacrifices in the spirit of the curses. When we approach God in praise, sorrow, petition and complaint it must be in a holistic way. We must speak with the law, covenants, curses, statutes, promises and decrees. 

God has given us a way to express our anger through the pronouncements of the curses to consecrate our anger. The Psalmist is comparing the violent act of slaying the animal with the heat of human anger.Christ not only satisfied the law by His active and passive obedience, death and resurrection, but He had to endure the violence in the punishment for our sin. This is why the Psalmist teaches that sin is the deliberate act of violent rebellion in redefining the legal pronouncements of the lawful king.God deals with the motivated violence by pronouncing the death to the offender.We cannot escape the lasting consequences of abuse as we relate to sinners. Consequently, we infected by the active virus of personal anger that must be quarantined in the authoritative pronouncement of the curse. If God enthusiastically embraces us with appropriate action then He must respond to sin by mending the specific abuse we experience. So God has spoken the curses for us to experience His effective defense so that we are sufficiently restored. If we do not exploit the legitimate defense in the curses then we invariably cause the anger linger and it hardens our hearts.