Qui aliquid staruerit parte inaudita altera
Qui aliquid staruerit parte inaudita altera, aequum licet dixerit, haud aequum facerit. He who decides anything, a party being unheard, though he should decide right, does wrong. 6 Co. 52.
A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.