The Old Testament is full of violent accounts that seem contradictory to the idea of the merciful, compassionate God of the New Testament: Joshua exterminates the tribes living in the Promised land, Samuel hacks the helpless Agag to pieces, and God orders Saul to kill every living thing when he conquers the Amelikites, to name but a few. The key to interpreting these texts is the figure of Christ as the sacrificed lamb in the Book of Revelations. If we keep Christ in mind then we will know that we have misread the Bible if we read it in such a way that it encourages violence or hatred
Bishop Barron’s Sunday Sermons - Catholic Preaching and Homilies