Charles Ellicott Commentary Proverbs 3:8

"It will be health to thy navel, And marrow to thy bones." — Proverbs 3:8 (ASV)

Navel. —As it is the center, and so the most important part of the body. (Compare the epithet applied to Delphi, “navel of the earth.”)

Marrow. —Literally, watering: that is, refreshing. (Compare Job 21:24.) For the opposite condition, “dryness of the bones,” compare Proverbs 17:22.