Midrash for Sanhedrin 122:23

ושוין שבשעירה כיחיד ושוין שאין מביא אשם תלוי

Abaye said: Whence do I know it? — For it has been taught: [As for an anointed High priest's<span class="x" onmousemove="('comment',' Until the destruction of the First Temple, High Priests were consecrated by anointing (Ex. XXVIII, 41; XXX, 30; Lev, VII, 36. X, 7); and one thus consecrated was called Kohen ha-mashiah (the anointed priest). But during the second Temple, when no anointing took place (Sifra Zaw, Par. 3 ch, v.). they were consecrated by investiture in the official garments of the High Priesthood. Such a high priest was called merubeh begadim, i.e., distinguished by a larger number of garments (eight as against the ordinary priest's four). ');">¹⁹</span>

Sifrei Devarim