The trees of the LORD are full of sap; the cedars of Lebanon, which he hath planted; The trees of the Lord are full of sap - ישבעו yisbeu, "are saturated."
The cedars of Lebanon - God's providence not only extends to then and cattle, but also to the trees of the field and forest. Many of these are not only sustained, but planted by his providence. Who ever planted the seeds of the cedars of Lebanon, or of the thousands of woods and forests on the globe? God himself sowed those seeds, and they have sprung up and flourished without the care of man.