What does the “terror of the Lord” refer to?” 2Co. 5:11
The word “terror” here is merely the common Greek word for fear – phobos (Strongs #5401; NIV “fear”). The threat is directed at believers for neglecting to preach. It is not about motivating us to preach because of the terror of hell awaiting sinners. Read this passage in context, noting especially 2Co. 1:1 and 5:10-11. The “we must all” consists of believers. In his first letter, Paul said, “Woe is me if I do not preach the gospel!” (1Co. 9:16).
Taken from Hope Beyond Hell page 224