The Old Testament prohibition against murder is broadened to include anger (5:21–22; Exod. 20:13), with a related call to reconciliation (5:23–26). Jesus also expands the prohibition against adultery to include lust (5:31–32; Exod. 20:14). The third case involves the Old Testament prohibition of remarriage to a first spouse after a divorce and second marriage have occurred (Deut. 24:1–4). Jesus again …
Baker Publishing Group, The Baker Illustrated Bible Commentary, by Gary M. Burge