Albert Barnes Commentary Proverbs 3:8

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

Navel - The central region of the body is taken as the representative of all the vital organs. For “health” we should read healing, or, as in the margin. There is probably a reference to the local applications used by the surgery of the period as means of healing.