משלי ג:ח פירוש: רש״י

It shall be healing for your navel Heb. לשרך. The wisdom shall be healing. שרך is like (Song 7:4): שררך, which means, your navel.

and marrow for your bones Heb. ושקוי, lit. moisture. That is the marrow, as the matter is stated (Job 21:24): “and the marrow of his bones is moistened.”