Origen de Principiis Book III

For occasionally the mind, when watchful, and casting away from it what is evil, calls to itself the aid of the good; or if it be, on the contrary, negligent and slothful, it makes room through insufficient caution for these spirits, which, lying in wait secretly like robbers, contrive to rush into the minds of men when they see a lodgment made for them by sloth; as the Apostle Peter says, "that our adversary the devil goes about like a roaring lion, seeking whom he may devour."[346]

Cyprian Treatise X On Jealousy and Envy

Therefore, beloved brethren, we must be on our guard, and strive with all our powers to repel, with solicitous and full watch-fulness, the enemy, raging and aiming his darts against every part of our body in which we can be stricken and wounded, in accordance with what the Apostle Peter, in his epistle, forewarns and teaches, saying, "Be sober, and watch; because your adversary the devil, as a roaring lion, goeth about seeking any one to devour."[3]

The First Epistle of Clement Concerning Virginity

conquer the lion;[39]

The First Epistle of Pope Fabian

Furthermore, we desire you to know this, that in our times, as our sins embarrassed us, and that ancient enemy who always goeth about like a roaring lion, seeking whom he may devour,[4]

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Old Testament