Then the high priest tore his clothes, and said, What need have we of any further witnesses?
Read Chapter 14
George Leo Haydock
Caiphas, in order to excite their hatred against what was said, rent his garments, and thus deprived himself of the priestly dignity, by transgressing the precept; which, speaking of the high priest says: He shall not uncover his head, and his garments he shall not rend. (Leviticus xxi. 10.) (St. Leo the Great)
By the high priest rending his garments he shews, that the Jewish priesthood, on account of their crimes, was now dissolved; whereas the tunic of Christ, by which the one true Catholic Church is prefigured, was seamless, and not to be divided. (Ven. Bede)