Eusebius of Caesarea — as excerpted in the Catena Aurea on Luke 24:1-12

“The messengers of the health-bearing resurrection and their shining garments stand for tokens of pleasantness and rejoicing. For Moses preparing plagues against the Egyptians, perceived an angel in the flame of fire. But not such were those who appeared to the women at the sepulchre, but calm and joyful as became them to be seen in the kingdom and joy of the Lord. And as at the Passion the sun was darkened, holding forth signs of sorrow and woe to the crucifiers of our Lord, so the angels, heralds of life and resurrection, marked by their white garments the character of the health-bearing feast day.”