Genesis 24:33 again shows the servant refusing to eat — reinforces the same pattern of self-denial for a duty, now matched with refusing sleep.

Ruth 3:18 says Boaz will not rest until the matter is settled — same language of not resting until a righteous purpose is accomplished.

Proverbs 6:4 uses nearly identical phrasing about not giving sleep to eyes — likely a direct allusion to this vow.