No Christian Duty of Festival Days - Chrysostom

When he said "As often as," (1 Corinthians 11:26) Paul gave the right and power to decide this to those who approach the mysteries, and freed them from any obligation to observe the festival days. Fathers of the Church, St. John Chrysostom, Discourses Against Judaizing Christians, translated by Paul W. Harkins, Discourse III, section IV, paragraph 2 (p. 59)