Today's first reading clearly describes God's rejection of Saul's kingship. Saul, sensing God's disfavor, asks for forgiveness, but it is too little, too late.
[links to Bible Gateway open in a new window]Reading the Bible in Its Entirety
The second selection tells how David, perhaps a most unlikely candidate, is selected by God to be Saul's successor as king. Even more interesting, David's selection is immediately followed by King Saul inviting the boy to join his court as an armor-bearer and musician.
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If you are planning to read the Bible in its entirety, you should read 1 Samuel 14-19 today.