Today's first reading tells how God provided food and water for the Hebrews while they were in the wilderness, particularly the provision of the mysterious food, manna.
The second selection is the beginning of God's law, torah, given to the Hebrews. The most famous of these are known as the Ten Commandments, given to Moses on Mt. Sinai.
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Reading the Bible in Its Entirety
If you are planning to read the Bible in its entirety, you should read Exodus 17-24 today.