I use the IVP Bible Background Commentaries almost every week, and the New Testament volume is one of the first resources I reach for when I want to understand the Jewish, Greek, and Roman world behind a passage. Keener explains customs, rhetoric, social structures, political realities, and historical details that the original audience would have recognized but modern readers may not.
Scripture was written for us, but it was not written directly to us. This kind of cultural background helps us build a more faithful imagination of the text while still keeping close reading of Scripture at the center. Honor and shame, household expectations, Roman rule, travel, worship, and social customs can all affect how a passage lands.
This commentary does not replace exegesis. It supports it. For anyone teaching Scripture regularly, it is one of those reference books you will use far more often than you expect.