A MAJOR TEXTUAL CORRUPTION
"WE HAVE" (exo) PEACE (Indicative Mood) [TR & AV]
"LET US HAVE" (exw) PEACE (Subjunctive Mood) [CT mss.]
The changing of the omicron to an omega by many of the critical text manuscripts completely loses the entire idea Paul is trying to convey concerning our position in Christ and the peace with God that justification immediately affords the once estranged sinner. If one is justified, no exhortation is needed toward the reality of the peace that exists at once with the new position.
Since the difference in pronunciation between o and w in the Hellenistic age was almost non-existant, when Paul dictated exo, Tertius, his amenuensis (16:22) may have written down exw). Bruce Metzger "A Textual Commentary On The Greek New Testament."