Today's first reading tells emphasizes the most important part of the law, that the people place their complete trust in God. It also warns that bad things could happen if they turn away from God or forget God.
[links to Bible Gateway open in a new window]Reading the Bible in Its Entirety
The second selection elaborates on this teaching, warning the Hebrews not to forget God in good times, especially if they become wealthy.
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If you are planning to read the Bible in its entirety, you should read Deuteronomy 1-7 today.