Following the logic of Gerhard von Rad, Sidney Greidanus discusses how the OT Prophets and NT authors understood God’s word as being God’s deed:

“You have been born anew … through the living and abiding word of God.” If anyone should wonder what the word of God is precisely, Peter explains: “That word is the good news which was preached to you” (1 Pet 1:23, 25). Like the prophets and Paul, Peter is convinced of the power of the preached word. That power is not some magical force in the words themselves but is the power of God whose word it is, for the gospel “is the power of God for salvation to every one who has faith” (Rom 1:16). The New Testament, therefore, views preaching as “God in action.” Preaching is not merely a word about God and his redemptive acts but a word of God and as such is itself a redemptive event (The Modern Preacher and the Ancient Text: Interpreting and Preaching Biblical Language, 5).