Ruth 3:18

Then said she, Sit still, my daughter, until thou know how the matter will fall: for the man will not be in rest, until he have finished the thing this day.

Cross-reference

Psalm 132:4 uses the same 'will not rest until' phrasing as Boaz's vow—a strong verbal parallel of determined action.

Psalm 37:3-5 encourages trusting God and waiting for Him to act—parallel to Naomi's advice to wait for Boaz to settle the matter.