Nicene and Post-Nicene Fathers, Ser. II, Vol. XII: The Letters and Sermons of Leo the Great.: To the Bishops Assembled in Synod at Chalcedon.
p. 84 Letter CXIV.
To the Bishops Assembled in Synod at Chalcedon.
(In answer to their Letter (XCVIII.), approving of their acts in the general so long as nothing is contrary to the canons of Nicæa.)