When Moses uses the metaphor of a rock, he thinks of the connotative qualities of enduring, unchanging, solid, awesome, strong, majestic, and beautiful.
Psalm 80 shows that the Shepherd of Israel sat between the Cherubim in the Holy of Holies, showing that Jesus Christ is the God who interacted with Israel.
In the peace offering, Christ is the priest, offeror, and offering. Since all parties share the peace offering as a meal, it exemplifies a peaceful communion.
It is high time for our conception of Christ to rise above the mere physical, which Christmas tends to emphasize, to the glories of His present and future work.
Keeping the Feast of Tabernacles includes temporary dwellings, rejoicing before God, and learning to fear God and faithfully keep His law.