Lactantius

“ Then death came upon man according to the sentence of God; and yet his life, though it had begun to be temporary, had as its boundary a thousand years, and that was the extent of human life even to the deluge. For after the flood the life of men was gradually shortened, and was reduced to a hundred and twenty years. But that serpent, who from his deeds received the name of devil, that is, accuser or informer, did not cease to persecute the seed of man, whom he had deceived from the beginning. ”

“ Nor did he cease upon this from infusing the venom of malice into the breasts of men through each generation, from corrupting and depraving them; in short, from overwhelming them with such crimes, that an instance of justice was now rare, but men lived after the manner of the beasts. ”

“ But when God saw this, He sent His angels to instruct the race of men, and to protect them from all evil. He gave these a command to abstain from earthly things, lest, being polluted by any taint, they should be deprived of the honour of angels. ”