John Gill Commentary Proverbs 30:23

"For an odious woman when she is married; And a handmaid that is heir to her mistress." — Proverbs 30:23 (ASV)

For an odious [woman], when she is married Odious for her person, her ugliness, and the deformity of her body; or rather for the ill qualities of her mind, which, while single, she endeavours to conceal, but, being married, hides them no longer; but becomes imperious, proud, scornful, and malicious, and behaves in an ill natured way to her husband and all about her, to such a degree, that there is no bearing the place where she is;

and an handmaid, that is heir to her mistress ; that has got so much into her affections that she leaves all she has to her when she dies, which makes her insufferably proud and vain; or she marries her master after the death of her mistress, and so coming into her place enjoys all she had, but only her wisdom and humility; which being wanting, she behaves in such a manner as to make the whole family uneasy.

This might be exemplified in the case of Hagar, the bondmaid of Sarah, a type of those that are under the law of works, and seek the inheritance by it; and who trust in themselves that they are righteous, and despise others, (Genesis 16:4–6) (21:10) (Galatians 4:24–31) .