O feast full of blood!
...Better would it have been not to have sworn thine oath, O iniquitous Herod, grandson of lies! For even though thou didst make thy vow, it was not well sworn. Better it would have been to be proved false, than to cut off the head of the forerunner, who spake the truth...
from Great Vespers and Matins tone VI
August Menaion p. 324 and 329