It shall be health to thy navel
That part of the body which is the knot of the intestines; and may be put for the bowels and inward parts, which being sound, the body is in health; and these may be put for the whole body: and so the Septuagint version renders it, "to thy body"; and this may be put for the whole person. And the sense is, either wisdom, as Jarchi; the doctrine of wisdom, the Gospel; which teaches men to trust in the Lord, and not in themselves, to apply to him for wisdom, and not lean to their own understanding; this contributes much to a man's spiritual health and welfare: or else the fear of the Lord is of this use to men, both in soul and body; since by it they depart from those sins which bring diseases upon the body; and are influenced by it to the exercise of such graces, and the discharge of such duties, as are the means of keeping the soul in good plight; and marrow to thy bones;
or, "watering" F13 to them: that which irrigates and moistens them, and makes and keeps them strong and solid: see ( Job 21:24 ) . What marrow is to the bones, that is wisdom, or the fear of God, to the souls of men; the means of establishing and strengthening them against sin, and snares and temptations, and to do the will and work of God.
F13 (ywqv) "irrigatio", V. L. Montanus, Tigurine version, Vatablus, Junius & Tremellius, Piscator, Cocceius, Amama, Schultens.