By: Dr. Ramez Mikhail
The following hymn is known as “Kata ni-khorous El-Hegab” that is “Kata Nikhouros of the Veil” because it is said when the doors of the sanctuary are closed, which are considered the veil of the sanctuary. It is common that “ou nim nai symphonia” is chanted by itself instead of the entire hymn (from tasbeha.org)