It was not without good reason that the angel appeared in the temple, for the coming of the true High Priest was now announced, and the Heavenly Sacrifice was preparing at which angels were to minister. For one cannot doubt that an angel stands by where Christ is sacrificed. But he appeared at the right hand of the altar of incense, because he brought down the token of Divine mercy. For the Lord is on my right hand, so that I should not be moved. (Ps. 16:8.)
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).