Today's first reading describes how the Hebrews are instructed by God to conduct their wars and treat foreigners that they wish to conquer. At times gruesome, it also offers a glimpse of the most important thing about warfare -- not military might, but faith in God.
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Reading the Bible in Its Entirety
The second selection teaches the people what God expects them to give out of their harvests and wealth for the benefit of God's priests and other people, including foreigners, orphans, widows, and others in need.
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If you are planning to read the Bible in its entirety, you should read Deuteronomy 22-28 today.