“Bishop Paschasinus, guardian of the Apostolic See, stood in the midst [of the Council Fathers] and said, ‘We received directions at the hands of the most blessed and apostolic bishop of the Roman city [Pope Leo I], who is the head of all the churches, which directions say that Dioscorus is not to be allowed to sit in the [present] assembly, but that if he should attempt to take his seat, he is to be cast out. This instruction we must carry out‘” (Acts of the Council, session 1 [A.D. 451]).
“After the reading of the foregoing epistle [The Tome of Leo], the most reverend bishops cried out: ‘This is the faith of the fathers! This is the faith of the apostles! So we all believe! Thus the orthodox believe! Anathema to him who does not thus believe! Peter has spoken thus through Leo!‘” (ibid., session 2).