A good argument can be made that 1 Thessalonians 2:14–16 are a later addition to Paul’s letter; see Birger Pearson, “1 Thessalonians 2:13–16: A Deutero-Pauline Interpolation,” Harvard Theological Review 64 (1971), pp. 79–94. Some scholars have agreed with Pearson, but some have disagreed, and the issue remains unsettled.