רִ֭פְאוּת תְּהִ֣י לְשָׁרֶּ֑ךָ וְ֝שִׁקּ֗וּי לְעַצְמוֹתֶֽיךָ׃
Es wird Gesundheit für deinen Nabel und Mark für deine Knochen sein.
Rashi on Proverbs
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.
Rashi on Proverbs
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.”